Delta Faucet RP77737 Seats and Springs Kit Rubber seats and steel springs Repairs leaks in Delta single-lever faucets with stainless steel ball valves or Delta 2 or 3 handle faucets with plastic cartridges Includes 2 rubber seats, 2 new style springs, and 2 old style springs to fit a variety of faucet models Perfect for contractors, maintenance repair professionals and do-it-yourself owners Lifetime limited warranty covers parts and finish defects Plastic