12mm In-Line Shutoff Valve. Push Fit Connectors. These fittings are designed for hot or cold water systems in touring caravans. The pipe is simply pushed into the fitting to form a safe secure connection. The body is produced in acetal copolymer. O Rings are nitrile rubber. The collet is produced in acetal copolymer with stainless steel teeth. Minimum Working Temperature -20c. Maximum Working Temperature +70c.