Relief valves again?

[The Magician]

Any one using a Cobbs relief valve?

 

[Jay D]

Had one just like it and switched to FRee flow. More consistent vac now. Larrys are set at 17hg, mine was at 14hg and seemed to leak air at that hg.

 

[carpet cleaner]

I use the Cobb's Relief Valve, works fine.