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bootabb67
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# Posted: 27 Apr 2026 09:20am
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rpe
more build details would be great if you can share thanks
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rpe
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# Posted: 28 Apr 2026 09:38pm - Edited by: rpe
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Quoting: bootabb67 rpe more build details would be great if you can share thanks
Basic design requirements:
1.) Hold motor/pump off bottom of lake: ABS stand does this - bottom horizontal leg should be filled with concrete to provide ballast and improve stability. I had to add external blocks to keep the assembly in correct orientation. A Fernco 4" to 3" rubber coupling fits to the 4" ABS tube, and fits nicely around the discharge end of the pump. To keep the motor/pump centered near the bottom a few small abs spacers were glued in place inside the 4" ABS.
2.) Provide cooling flow of water across length of motor - 4" ABS housing simulates a 4" well pipe to provide cooling by pulling water up past sides of motor. These units can fail prematurely if run in open water without a housing around them.
3.) Allow for water inlet above lake bottom - 1-1/2" ABS elbow and feed pipe run up above main pump tube.
4.) Incorporate drain-back valve to allow draining back to lake for winter. This is specific to my winter water design, and may not be needed.
Those are the primary features I can think of at the moment.
The basic frame is just spare ABS fittings and scraps I had laying around. The main tube is 4", as stated above. The lower leg could be 4" as well, but has tees and caps in 3", so reduced down.
Any other details needed?
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bootabb67
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# Posted: 29 Apr 2026 07:32am
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Hi Thanks for the reply
wondering
how did you attach the 1 1/2 inch elbow to the 4 inch main pipe
thanks again
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rpe
Member
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# Posted: 29 Apr 2026 02:05pm
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Ah, the 1-1/2 to 4" magic connection? That's below the bottom of the pump, so I think there's a stub of 1-1/2" ABS through a snug fit hole, retained with a ring cut from another ABS fitting on the inside. Parts that mated with the 4" were filed to match the pipe radius, all bonded with ABS cement. BTW, there are caps on both 3" ends, as well as the 4", so all pump flow is pulled up from the open end of the 1-1/2" up top. A coarse screen at that end would be a good idea.
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