Pressure Gauge Glycerin filled 2.5" Bottom Mount

 
 
$12.50
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These glycerin-filled gauges are a great addition to your pool equipment.  Larger and easier to read than virtually all the standard gauges, they still fit 1/4" npt thread so it is as simple as unscrewing the old one, wrapping the new threads in 2-3 turns of teflon tape and screw it on.  Hand tighten only.  No tools required.

 

It is a good habit to check your filter psi every time you walk past the pump and especially when you turn the pump on.  Even a variation of 1/2 pound is easily detectable with these nice gauges.

 

Glycerin filled, they are freeze protected down to -4º F.