Pipe repair clamps 3 inches clamp single bolt size 1/2 inches Provides positive seal on leaking pipes, type 430 stainless steel, max operating temperature 167 degrees F. Rated up to 150 PSI. Mueller offers a full line of high efficiency 304L stainless steel repair clamps for all types of pipe repair problems. They are used to repair holes, leaks, splits, circumferential breaks and cracks, as well as to correct pulled or leaking service connections. Stainless steel clamps can be installed above or below ground and are available for all types of pipe, with styles especially suited for use in hot soils or corrosive atmospheres.