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".

An image is worth 1,000 words! Add an image or two to your comment to help ensure it is understood accurately.



Yes, please email me exclusive discounts, swimming pool tips and helpful how to guides. This comment may be posted on a public site. Do not include: HTML, references to other retailers, pricing, personal information, or any profane, inflammatory language.