Question about Hayward SAND FILTER, PRO SERIES
Most hayward sand filters use a GMX600F or GMX600F-H o-ring.
If it is an older tank it might use the GMX400F which is smaller, and rare to come across. Most 400 Valves are not marked vari-flo.
Hope it helps.
Posted on Jul 23, 2009
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Posted on Jan 02, 2017
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