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Thanks for your reply, i attempted to use the 4 inch no hub corrugated metal shield to connnect the pvc to cast iron because it is easy to roll back. there was at most 1/32 inch gap between the pvc and cast , and I still feel a slight leak on both sides of backwater valve. Would a thicker rubber...

Hello, I really would like to use the corrugated metal shield 4 " to connect pvc to cast iron 4 " becaquse i can easily roll it back on the cast iron to install a 4 " backwater valve in my basement. A plumber told me to use a proflex 3000-44 smooth stainless shield coupling. I practiced in a...

Hello, this is slightly off topic, I am installing a backwater valve 4 " in basement. One end is tight quarters connecting pvc to castiron. It seems like the advice is the smmoth stainless steel outside coupling. I was very confident that I could roll back the corrigated stainless shielded...