Twin shut-off valves control water flow for two hoses. Cap type valve handles resist breakage. Longer legs prevent hose kinks at faucet. Full ball and retainer rings reduce leakage, even at low pressure. No. 17: Non-corroding, high impact poly construction. Not recommended for hot water. No. 15: Chrome-plated zinc construction. Withstands hot water temperatures to 160 degrees Fahrenheit.