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Oh, and one other thing. Thank you, Bama Rambler, for telling me that "somewhere in the past the thread style on that valve and filter got changed from one type to another. They're physically the same size but the thread profile is different." That is exactly what happened. The pre-1991 valve...

It turns out that there are three versions of this Hayward Multiport Vari-Flow 1-1/2" valve: V thread - SP07122 Buttress thread - SP07121 Clamp-on I ordered the Buttress thread but should have ordered the V thread. I've now ordered the V thread and as soon as it arrives I'll try it out and...

Thank you very much. That would explain why I can't get the new Hayward valve to screw into the old Truflo filter. I ordered a Hayward valve because that's what was on there previously. I will post a pic of them both when I get home later today. I'm glad to learn about thread profiles; just...

I just purchased a Hayward SP0712 Series Vari-Flow Valve and cannot get it to screw into my Truflo TM 60 fiberglass sand filter. It is the same model valve as was previously on the filter, which WILL screw on. The new valve will not catch the threads properly to screw on. The filter is very...