Rolin Posted March 24 Report Share Posted March 24 hello, I recently bought a house with an ingroung pool and I came across this piece of pvc in line with the return, Can anyone tell me what this is for? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted March 27 Report Share Posted March 27 From the shape I'd say it's a mazzei valve (venturi) designed to generate a vacuum on one or more small connected lines. These are often used for injection of chemicals or ozone, though it appears this one is plugged off and unused. Quote Link to comment Share on other sites More sharing options...
Rolin Posted April 6 Author Report Share Posted April 6 Thank you for the response, this is still connected in my pool lines and no-one that've come and looked at it have been able to tell me what it was for. thank you so much Quote Link to comment Share on other sites More sharing options...
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