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The New Pump have some water inside due to factory test, every pump will undergo a rigorous test before put on the market NEW 12V Self-Priming Water Pressure Pump 1.1Gallons/Min (4.3 LPM) 35 PSI
Product Details: This product is 100% brand new and comes in original color packing Powerful automatic pressure pump 1.1 Gallons Per Minute (4.3 LPM) capacity flow, and 35 PSI pressure Extremely efficient,
very low current draw and offer high capacity output Self priming Smooth,
silent operation Can run dry without damage Thermal overload and ignition protection Easy connecting system Low power draw Soft rubber mounts Professional grade pump -
Ideal for marine, caravans/RV, and agriculture applications Built-in pressure switch, to automatically turn on and off as you turn your tap or nozzle on and off Beware of inferior non-genuine products on the market that claim to be just as good
Specifications
Voltage: 12V DC Flow capacity: 1.1 Gallons per minute (4.2 Litres per minute) Water pressure: 35 PSI Hose Outlets: Fixed 10mm (3/8") diam.
hose tails Twin core wire Current Draw: 1.7 Amp (max. 2.7 Amp) Dimensions: Length 170mm x Width 100mm x Height 67mm Approvals: CE Applications For marine, RV, agriculture and recreational applications Suits all size boats, caravans, mobile homes, etc.
For sinks, taps, showers, or toilets Other applications where you have to transfer water

On-demand, automatic water pump for small boats, campers, and vans
Built-in 35 PSI pressure switch for automatic stop/start
Self-priming--allows it to be mounted above tank; able to run dry
Built-in thermal protector; 3/8-inch hose barb ports
1.1 Gallons per minute (4.2 Litres per minute) ;The New Pump have some water inside due to factory test, every pump will undergo a rigorous test before put on the market

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Amarine-made 12v Water Pressure Diaphragm Pump 4.3 L/min 1.1 GPM 35 PSI - Caravan/rv/boat/marine

Brand: alfa marine (Shanghai)
Product Code: PRD-PNN-9431962
Availability: In Stock

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Dynamic Head

The effect of the Earths gravity on the "lift" or head pressure is fairly simple; for every vertical foot of distance the pump moves the water you are adding one foot of head pressure so the ratio is a 1:1 ratio. The effects of the friction, caused by water as it travels through your hose or pipes, on the total head pressure is a little more difficult to calculate especially as there are slight variations in pipe friction in different hose materials and the smoothness of the inner bore. Basically. for every ten feet of pipe through which the water has to travel travel horizontally will contribute 1 foot of head height; the ratio of the pipe friction loss is a 10:1 ratio.

Plumbing fixtures and bends and corners in your hose also increase the total head you must calculate to ensure the proper final volume from your pump. Every corner with a 90 degree elbow in your plumbing will add 1 foot of head pressure with a 1:1 ratio. 45 degree elbows, tees and even insert couplers can all have an impact on the final flow.

If you install a pump 40 feet away from the top of your waterfall which is 6 feet above the pump and the tubing is a single run of 40 feet horizontally then you add 4 feet of head for the tubing length (the 10:1 ratio) to the 6 foot differnetial between the pump location and the final height of the waterfall so your final total dynamic head calculation would be 10 feet. This means your final volume of water flow in this water feature or application would be the volume of flow on the performance curve that equaled the gallons per hour at 16 feet. This volume will certainly be much less than the initial volume the pump can move at an open flow or a zero head.

If in the above example your 40 feet of horizontal tubing run also required 3 elbows of 90 degrees then an additional 3 feet of theoretical head would be added and your final flow result would be at 19 feet on the performance curve of the pump. In this example you would want to choose a pump that has the desired GPH rating at 9 feet of head pressure. Tubing size is also an important factor in accounting for head pressure loss, in general you should never reduce the diameter of the tubing below what the output size of the pump is, this will drastically increase head pressure, and reduce pump performance. For maximum pump performance, using the largest tubing that is practical is the best choice. A best practice is to use a hose with an inner diameter that is the same as your pumps outlet fitting.