Response to Hello Roberto. The attachment threads of the Pentair Filter Pressure Gauge w/ Indicator Rear Mount, OEM - 190059 are 1/4" NPT (National Pipe Tapered Threads). NPT threads taper at a rate of 3/4" per foot. Per NTP Technical Specification the outside diameter of the 1/4" Nominal Pipe Size is 0.540". Most pressure gauges (top mount or bottom mount) in the pool & spa industry have identical thread patterns, 1/4" NPT with an outside diameter of approx. 1/2".
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