Response to I have the Praher SM20-2 filter and it is leaking. Rather than attempt to repair the gasket I just want to replace the entire unit. It looks like the PVC fittings screw into the valve. 1) Does this look like the correct unit to replace what I have? 2) Can you give me brief description of how these couplers screw into the valve? Any cutting or gluing PVC necessary to swap out? Do I need new O rings? Does it come with couplers? Thanks

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