Fluidmaster® PRO CLICK SEAL® Toilet Connector, 3/8 x 7/8 in Nominal, Compression x Ballcock, 12 in Length, 125 psi Working, 40 to 150 deg F, Braided, 304 Stainless Steel
This innovative two-piece nut uses the same theory as the gas cap on a car, the nut clicks when it's sealed. All you need is a Click Seal® water supply connector, a hand to tighten it, and a click to let you know it's sealed.