Pond pump reducing adapter

by sharv999, published

Pond pump reducing adapter by sharv999 Dec 19, 2012
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2788Views 568Downloads Found in Outdoor & Garden


I needed to reduce the internal diameter of my fish pond pump outflow port from 22 mm to 12 mm to suit the existing hose setup so I designed this reducing fitting. You can change the diameters in the OpenSCAD to suit your own installation. My first OpenSCAD to STL project :-)


Printed on a Replicator 1 using 1.70 mm ABS at 100% infill (watertight ...) with 0.2 mm layer thickness and 50 mm/s feed rate. Use a raft and print with the larger diameter sitting flush with the build plate.

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Usually on pumps, more stress is added when the bore is fully open as then the pump will shift more fluid. As long as there is enough flow to cool the pump, then a smaller bore means a smaller load.

This is neat, but it will put more stress on your pump, reducing it's life and maximum head, but if those don't matter, it's perfect!

I cheat in my pond and use old garden hose on my pump output.

Yep - agreed. Not the most elegant fluid mechanics solution but it was a good introductory exercise in OpenSCAD :-) Thanks for the comment!