• Little Giant 566409 WGP-65-PW Premium Submersible Pond Pump, 1900-Gallons Per Hour
Little Giant WGP-65-PW (566409) is a 1/8HP Direct Drive Dual Discharge Pond/Waterfall Pump with 16' cord. This Little Giant Pump has the unique feature of having dual 1-1/4" FNPT discharges and has been designed to operate waterfalls, streams, and fountainheads or just circulate the water in a pond. Dual discharges of the Little Giant WGP-65-PW pond pump make it possible to perform two of the above tasks at the same time without having to purchase two pumps. A cap plug included to allow one of the discharges to be closed if only one discharge is to be utilized. An elbow adapter is also included to adapt from the discharge of the pump to 1" smooth tubing.The Little Giant WGP-65-PW can either be installed in the upright or vertical position or it can be installed in the horizontal position lying on the base.
  • 1900 GPH @ 1 Feet head
  • Voltage: 115
  • 1/8 horsepower
  • Unique dual-discharge design allows for operation of two water features simultaneously
  • Includes two 1-1/4-Inch MNPT x 1-Inch barbed elbow adaptor and a 1-1/4-Inch MNPT discharge cap

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Little Giant 566409 WGP-65-PW Premium Submersible Pond Pump, 1900-Gallons Per Hour

  • Brand: Little Giant
  • Product Code: 100509847
  • Availability: 20
  • $244.00
  • $201.39



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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.