{"product_id":"rule-55s-3700-series-automatic-submersible-bilge-pump-3700-gph","title":"Rule 55S 3700 Series Automatic Submersible Bilge Pump - 3700 GPH","description":"\u003cp\u003eThe Rule 55S is an automatic submersible bilge pump rated at 3,700 GPH (14,010 LPH; approx. 233 litres\/minute). It checks for water every 2.5 minutes and runs when resistance at the impeller indicates water is present, so no separate float switch is required.\u003c\/p\u003e\u003cp\u003eThe Rule 55S combines a fully submersible centrifugal bilge pump with integral automatic control. During normal operation the pump briefly checks for water at 2.5-minute intervals and continues running when water is detected. This eliminates the need for a separate float switch while retaining a compact installation footprint.\u003c\/p\u003e\u003ch4\u003eProduct Identification\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Rule\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct name:\u003c\/strong\u003e Rule 55S 3700 Series Automatic Submersible Bilge Pump - 3700 GPH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel \/ part number:\u003c\/strong\u003e 55S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine Scene SKU:\u003c\/strong\u003e CW-55S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct category:\u003c\/strong\u003e Automatic submersible bilge pump\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated open flow:\u003c\/strong\u003e 3,700 GPH (14,010 LPH; approx. 233 litres\/minute)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic operation:\u003c\/strong\u003e Yes - integral timed water-sensing operation; no separate float switch required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarge hose size:\u003c\/strong\u003e 38 mm (1-1\/2 in)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent draw:\u003c\/strong\u003e 15.5A at 12V; 20.0A at 13.6V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended fuse:\u003c\/strong\u003e 25A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity supplied:\u003c\/strong\u003e One pump\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhat Is the Rule 55S Bilge Pump Used For?\u003c\/h4\u003e\u003cp\u003eThis pump is used for automatic removal of nuisance water from larger yachts, motor cruisers and high-capacity bilge installations. It is intended for permanent marine installation and should be selected by required flow, supply voltage, discharge-hose size and expected discharge head.\u003c\/p\u003e\u003ch4\u003eWhat Is Included?\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOne Rule automatic submersible bilge pump\u003c\/li\u003e\n\u003cli\u003eIntegral timed water-sensing control\u003c\/li\u003e\n\u003cli\u003eIntegral or snap-lock strainer base\u003c\/li\u003e\n\u003cli\u003eFactory-fitted marine-grade electrical leads\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhat Is Not Included?\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDischarge hose, through-hull fitting and hose clips\u003c\/li\u003e\n\u003cli\u003eOptional panel switch\u003c\/li\u003e\n\u003cli\u003eCable extensions, waterproof connectors and circuit-protection fuse\u003c\/li\u003e\n\u003cli\u003eInstallation hardware not supplied with the packaged pump\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhich Boats and Bilge Systems Is This Pump Suitable For?\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSuitable for larger yachts, motor cruisers and high-capacity bilge installations.\u003c\/li\u003e\n\u003cli\u003eConnect to 38 mm (1-1\/2 in) discharge hose.\u003c\/li\u003e\n\u003cli\u003eChoose the variant that matches the vessel electrical system: 12V.\u003c\/li\u003e\n\u003cli\u003eA compatible Rule panel switch may be fitted where manual override or status control is required.\u003c\/li\u003e\n\u003cli\u003eNo separate external float switch is needed for automatic operation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eHow Does the Automatic Operation Work?\u003c\/h4\u003e\u003cp\u003eYes - integral timed water-sensing operation; no separate float switch required The published automatic check cycle is pump checks for water every 2.5 minutes. Separate float switch required: No.\u003c\/p\u003e\u003ch4\u003eHow Do I Select the Correct Pump?\u003c\/h4\u003e\u003cp\u003eConfirm the complete installation rather than selecting by nominal GPH rating alone:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 12V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated open flow:\u003c\/strong\u003e 3,700 GPH (14,010 LPH; approx. 233 litres\/minute)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarge hose:\u003c\/strong\u003e 38 mm (1-1\/2 in)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstalled space:\u003c\/strong\u003e 209 x 124 mm (H x W)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCircuit protection:\u003c\/strong\u003e 25A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow at 1 m head:\u003c\/strong\u003e 2,900 GPH (10,977 LPH)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow at 2 m head:\u003c\/strong\u003e 2,450 GPH (9,274 LPH)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eDoes the Published Flow Equal the Installed Flow?\u003c\/h4\u003e\u003cp\u003eNo. The nominal capacity is an open-flow rating. Actual output reduces as discharge head, hose length, bends, restrictions and electrical voltage drop increase. Use the published flow-at-head figures where available and keep the discharge route as short and unrestricted as practical.\u003c\/p\u003e\u003ch4\u003eConstruction and Design\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement strainer part number:\u003c\/strong\u003e 279\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackflow prevention:\u003c\/strong\u003e No integral non-return valve stated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal protection:\u003c\/strong\u003e Built-in thermal cut-off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition protection:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e CE; ISO 8849 marine bilge-pump standard\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eInstallation and Safety\u003c\/h4\u003e\u003cp\u003eMount the pump at the lowest practical point of the bilge while maintaining access for cleaning. Wire directly through the specified fuse and follow the manufacturer wiring diagram for any manual-override lead. Keep electrical joints above the maximum bilge-water level, minimise hose length and bends, prevent siphoning, and test automatic operation before leaving the vessel unattended.\u003c\/p\u003e\u003ch4\u003eMaintenance\u003c\/h4\u003e\u003cp\u003eInspect and test the complete bilge-pump system regularly and before extended passages. Reduced flow, repeated fuse failure, unusual noise or slow switching requires investigation before the vessel is used.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eRemove debris from the strainer and impeller area.\u003c\/li\u003e\n\u003cli\u003eInspect the discharge hose, clips, through-hull and anti-siphon arrangement.\u003c\/li\u003e\n\u003cli\u003eCheck the wiring, fuse, terminals and control switch for heat, corrosion or damage.\u003c\/li\u003e\n\u003cli\u003eKeep the automatic sensor or float-switch movement clear of oil, dirt and debris.\u003c\/li\u003e\n\u003cli\u003eTest manual and automatic operation after cleaning or service.\u003c\/li\u003e\n\u003cli\u003eReplace damaged components rather than operating an unreliable bilge system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eNominal open-flow capacity: 3,700 GPH (14,010 LPH; approx. 233 litres\/minute)\u003c\/li\u003e\n\u003cli\u003eIntegral automatic water checking every 2.5 minutes\u003c\/li\u003e\n\u003cli\u003eNo separate float switch required\u003c\/li\u003e\n\u003cli\u003eBuilt-in thermal cut-off\u003c\/li\u003e\n\u003cli\u003eEasy-clean strainer and accessible impeller cavity\u003c\/li\u003e\n\u003cli\u003eIgnition protected; CE and ISO 8849 compliant\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eDoes this automatic pump need a float switch?\u003c\/strong\u003e\u003cbr\u003eNo. The automatic control is built into the pump.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does the pump run briefly when the bilge appears dry?\u003c\/strong\u003e\u003cbr\u003eThe pump checks for water at 2.5-minute intervals. It stops after the short check when no water resistance is detected.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I choose between the available variants?\u003c\/strong\u003e\u003cbr\u003eSelect the model that matches the vessel supply voltage: 12V. Also confirm the hose size, fuse rating and available installation space.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the stated flow equal the installed flow?\u003c\/strong\u003e\u003cbr\u003eThe stated capacity is an open-flow rating. Actual output falls as discharge head, hose length, bends, restrictions and voltage drop increase.\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cdiv style=\"width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch;\"\u003e\n\u003ctable class=\"spec-table\" style=\"width: 100%; border-collapse: collapse; font-family: Roboto, Arial, sans-serif; background: #ffffff; text-align: center;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: center; font-weight: 500;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: center; font-weight: 500;\"\u003e55S\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003eRule\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eProduct category\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003eAutomatic submersible bilge pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eMarine Scene SKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003eCW-55S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eRated open flow\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e3,700 GPH (14,010 LPH; approx. 233 litres\/minute)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e12V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eAutomatic operation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003eYes - integral timed water-sensing operation; no separate float switch required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eCurrent draw\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e15.5A at 12V; 20.0A at 13.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eRecommended fuse\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e25A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eFlow at 1 m head\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e2,900 GPH (10,977 LPH)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eFlow at 2 m head\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e2,450 GPH (9,274 LPH)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eMaximum recommended discharge head\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e209 x 124 mm (H x W)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eDischarge hose size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e38 mm (1-1\/2 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eReplacement strainer part number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e279\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eBackflow prevention\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003eNo integral non-return valve stated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eAutomatic check cycle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003ePump checks for water every 2.5 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eSeparate float switch required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eThermal protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003eBuilt-in thermal cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eIgnition protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003e\u003cstrong\u003eStandards\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; text-align: center;\"\u003eCE; ISO 8849 marine bilge-pump standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cem\u003eFlow ratings are nominal open-flow figures. Installed output will reduce as discharge head, hose length, bends, restrictions and supply-voltage loss increase.\u003c\/em\u003e\u003c\/p\u003e","brand":"Rule","offers":[{"title":"Default Title","offer_id":47309870432533,"sku":"ASAP-JAB-55S","price":379.98,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0773\/6151\/2725\/products\/55s.jpg?v=1698136128","url":"https:\/\/marinescene.co.uk\/products\/rule-55s-3700-series-automatic-submersible-bilge-pump-3700-gph","provider":"Marine Scene","version":"1.0","type":"link"}