The SS Pipe Flange Mount is Rated for 300 PSIG, The HP125 gets installed into a 3.75in diameter 304 SS Threaded Pipe Flange, 4 bolt install, includes rubber gasket
The Dark Gray PVC Pipe Flange Mount is Rated for 150 PSIG, The HP125 gets installed into a 3.5in diameter PVC Threaded Pipe Flange, 4 bolt install, includes rubber gasket.
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