S.U.R. and R Auto Parts SRRFLS330 Spring Loaded Fluid Stopper Kit, 4 Piece (4 Piece Spring Loaded Fluid Stopper Kit) Prevents messy leaks and contamination during service Universal design used to plug lines 3/16-1/2 Perfect for line repairs including brake coolant transmission & fuel lines Also works on banjo fittings up to 1/2"