huh ?
get 2 CPVC ASA 150# flanges with 1/2 NPT hubs, use 1/8" red rubber sheet to cut 2 flat gaskets, get 4 bolts of the appropriate length, 8 flat washers and 4 Ni-locks
- for the ground screw in 2 copper tubing adapters with a copper strap soldered on for the grounding wires
McMaster has it all if the local hardware does not
I have 3 set up this way, I cut out the lip on the flange ID with a knife to open the bore and reduce turbulence - then cut the gasket ID to fit that dia (the gasket OD need extend only past the sealing grooves on the flange face)
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