| Operates Like A Check Valve To Seal Off Water Back-Up Caused By Overloaded Sewers | Gaskets Are Made Of Molded Rubber, and All Metal Parts Are Plated Or Stainless
| Operates Like A Check Valve To Seal Off Water Back-Up Caused By Overloaded Sewers | Gaskets Are Made Of Molded Rubber, and All Metal Parts Are Plated Or Stainless Steel
| Operates Like A Check Valve To Seal Off Water Back-Up Caused By Overloaded Sewers | Gaskets Are Made Of Molded Rubber, and All Metal Parts Are Plated Or Stainless