A 4 inch rubber test cap(or what ever size you need) works great to seal drum traps after cap has been cut off. Then you can get it off and on easily with a screwdriver or a nut driver .This even works under house when drum trap is upside down,but would be tough if drum trap is buried in cement up to top of trap, then screw in a 3 '' pvc cap use silicone on threads to keep from leaking when it blocks again.Its up to you whether to drill hole in top of pvc cap and fix your self a place for future cleaning. In most cases the rubber test cap does the trick!! Easy @ quick, no worry about stripped threads.
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