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Float Switch, add states this is a "snap switch" . It is not. A snap switch operates differently , we have had customer complaints regarding the incorrect listing. Description should match the information on Great Lakes Skipper product page : Boat part number 1029065 is a new bilge pump float switch from SeaSense, part number 50010329 . This universal float switch measures approximately 4 1/2" L x 1 7/8" W x 1 3/4" D overall, and can be used with any submersible 12 volt pump and uses a ball type (no mercury) switch. Impact resistant ABS housing. Ignition protected. Specifications: Part Manufacturer: SeaSense Part Number: 50010329 Material(s): Plastic Colors): Silver / White Electrical: 12-36 Volt, 12 Amp; ax 36 Volt Overall Dimensions: 4 1/2" L x 1 7/8" W x 1 3/4" D Mount(s): (1) 1/8" diameter hole UPC 737765103294 Sold as seen in pictures. Customers please note every computer shows colors differently. All measurements are approximate. Instruction / installation manual included. Hardware not included.
  • NEW "Snap Switch" Uses No Mercury
  • Impact Resistant ABS Housing
  • Ignition Protected
  • 30? Tinned Marine Grade Wire Leads
  • Stainless Steel Mounting Screws

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Seasense Bilge Pump Float Switch

  • Brand: Seasense
  • Product Code: 50010330
  • Availability: In Stock


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50010410 Features: -Bilge pump. -600 GPH. -Impact resistant ..

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.