1-1/2 inch

RC-075-KW-4H, 3/4" Bore Rigid Shaft Coupling with keyway & Set Screw

I installed the Staburags NBU 30 PTM and it worked right out of the box.

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V-600-AA Royal Vacuum Breaker Assembly 1-1/2 X 9 for Royal Flushometers

A nice benefit of this double ended tool is the balance it provides during use.

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