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Rainbow Check Valve (2 # spring) 1-1/2" & 2" socket, R172288 Cross Reference: AquaCal (PLS2639) or Autopilot Can use this to repair the chattering check valve in the Aquacal Heat pump manifolds. Aquacal does not sell this separately. This is not clear but works perfectly. It will also work with the Autopilot manifolds.
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