3 models of Bilge Pump, please ensure you select the correct one 1100 GLP Manual Bilge Pump Operation: This is the basic model which requires an external switched feed to control it. It is On/off operation. I.e. a separate float valve is required or a manual on/off switch. There is no automatic function in this model. Do not leave running all the time in dry conditions. The pump should be off when there is no water present. Low Profile Bilge PumpManual/float valve Activation Model Description:- Low narrow design for tight/awkward bilge spaces- Easy installation - outlet and pump body 360 degree rotate to suit your installation- High performance - Flow up to 1100 gallons per hour / 4100 litres per hour- Efficient operation - Very low power consumption- Low profile strainer - Leaves the bilge almost dry- Easy to clean- snap fit assembly- Easy to clean - unique clever strainer design with 360 degree rotation function- Easy to clean - easy to remove and replace for cleaning- Non-return valve included - to prevent back flow- High or low water sensing automatic mode, pump starts or shut off when water rise and down. - CE, RoHS, ISO 8846, ISO8849 UKCA standards- Submersible and ignition protected- Stainless-steel motor shaft- Sealed efficient, long life motors- Quiet operation- Anti-Airlock protection- Motor can be sold separately- New innovative split quick-connect joint design removes and installs in seconds! No need to disconnect base or plumbing when replacing pump, which can meet the needs of most users.- Five-blade impeller to ensure high flow rate- Marine grade silicon blocked, tin coated wiring- 2 Year Warranty- Exclusive moisture tight sealsFlow rate: 1100 gph / 4100 lphHead: 4.0m/13ft12V 4.2A24V 3.0AWeight Net 0.39 Kg Gross 0.56kg Timer Bilge Pump Operation: This model has a built in 15 min timer where it switches on every 15 minutes and if no back pressure is detected (from water in the discharge pipe) then the unit assumes there is no water to be pumped and switches off. However, if a back pressure is detected then the unit will continue to pump until bilge pump is empty. Best used on boats where there is a persistent amount of water as continual on/off, when dry all the time, would result in excessive bearing ware. Description:- Low narrow design for tight/awkward bilge spaces- Easy installation - outlet and pump body 360 degree rotate to suit your installation- High performance - Flow up to 1100 gallons per hour / 4100 litres per hour- Efficient operation - Very low power consumption- Low profile strainer - Leaves the bilge almost dry- Easy to clean- snap fit assembly- Easy to clean - unique clever strainer design with 360 degree rotation function- Easy to clean - easy to remove and replace for cleaning- Non-return valve included - to prevent back flow- High or low water sensing automatic mode, pump starts or shut off when water rise and down. - CE, RoHS, ISO 8846, ISO8849 UKCA standards- Submersible and ignition protected- Stainless-steel motor shaft- Sealed efficient, long life motors- Quiet operation- Anti-Airlock protection- Motor can be sold separately- New innovative split quick-connect joint design removes and installs in seconds! No need to disconnect base or plumbing when replacing pump, which can meet the needs of most users.- Five-blade impeller to ensure high flow rate- Marine grade silicon blocked, tin coated wiring- 2 Year Warranty- Exclusive moisture tight sealsFlow rate: 1100 gph / 4100 lphHead: 4.0m/13ft12V 4.2A24V 3.0AWeight Net 0.39 Kg Gross 0.56kg Automatic Bilge Pump Operation: High to Low water automatic sensing mode. Pump starts when water 4.5 cm and stops at 1 cm. This model has a built in electrical sensor to sense the presence of water at a certain level. It is designed to automatically come on and off as required to maintain the bilge level with no external switching required. Description:- Low narrow design for tight/awkward bilge spaces- Easy installation - outlet and pump body 360 degree rotate to suit your installation- High performance - Flow up to 1100 gallons per hour / 4100 litres per hour- Efficient operation - Very low power consumption- Low profile strainer - Leaves the bilge almost dry- Easy to clean- snap fit assembly- Easy to clean - unique clever strainer design with 360 degree rotation function- Easy to clean - easy to remove and replace for cleaning- Non-return valve included - to prevent back flow- High or low water sensing automatic mode, pump starts or shut off when water rise and down. - CE, RoHS, ISO 8846, ISO8849 UKCA standards- Submersible and ignition protected- Stainless-steel motor shaft- Sealed efficient, long life motors- Quiet operation- Anti-Airlock protection- Motor can be sold separately- New innovative split quick-connect joint design removes and installs in seconds! No need to disconnect base or plumbing when replacing pump, which can meet the needs of most users.- Five-blade impeller to ensure high flow rate- Marine grade silicon blocked, tin coated wiring- 2 Year Warranty- Exclusive moisture tight sealsFlow rate: 1100 gph / 4100 lphHead: 4.0m/13ft12V 4.2A24V 3.0AWeight Net 0.39 Kg Gross 0.56kg Instructions Bilge Pump Switches Pumps works at 12V and 24V