Innovative heat trap nipples that save energy and also serves as a dielectric fitting to prolong tank life. Use on cold and hot water lines for best energy saving results. Heat trap nipple has a PEX Shield lining. Replacement part for: A.O. Smith, A.O. Smith Canada, American, GSW, John Wood, Kenmore, Lochinvar, Maytag, Mor-Flo, Penfield, Reliance, Sears, State Industries, U.S. Craftmaster, Whirlpool. Fits: Bradford White, General Electric, Rheem, Richmond, Ruud.