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Solo Diaphragm Pump and Cylinder

  • 3 Stars
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$ 34.74
> 5
$ 33.50
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# 4400221
In Stock
Weight: 1.70 lbs
Quickly and easily change out the complete pump and cylinder. Turns a 30-minute repair into a 5-minute task; a great backup part to keep on the truck!


  • Fits the Solo 475 and 475D
  • Includes a pressure regulator with four settings: 15, 30, 45 and 60 psi
  • Includes all required seals and O-rings, clamp and hardware

Product Features

  • Makes changing the diaphragm and pressure cylinder easier - fewer steps than ordering a bunch of components

Review Summary (Based on 2 Reviews)

1 Star

Solo Diaphragm Pump and Cylinder Replacement wrote

Thought replacement process would be fairly easy, but it's not. The cylinder is press fit into tank, have to hammer it in with 2x4 and hammer. Even lubricated, is very tight fit, o'ring seal did not seal final assembly so tank fluid leaks out bottom when pump pressure begins to get to 10psi or so. Cheaper to buy new unit.

5 Stars

It is not an easy job to replace the pump and cylinder. wrote

I remembered how difficult it was to replace just the diaphragm several years ago and read that the whold pump and cylinder was quicker and easier to replace. It wasn't.

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