John Guest connector valve. QUICK CONNECT PUSH-IN TUBE FITTINGS. NO TOOLS NEEDED. FAST CONNECT AND DISCONNECT. SUITABLE FOR PLASTIC OR METAL TUBES. THE FITTINGS ARE MANUFACTURED IN WHITE ACETAL COPOLYMER WITH FOOD GRADE EPDM O RINGS. THEY HAVE BEEN DEVELOPED FOR THE WATER INDUSTRY BUT ARE EQUALLY SUITABLE FOR OTHER POTABLE LIQUID APPLICATION LIKE WATER TREATMENT, WATER STORAGE, FOOD AND BEVERAGE DISPENSING, MARINE / RV SYSTEMS AND MANY OTHER INSTALLATIONS. MADE IN ENGLAND.