The apollopex, pex b ratcheting pinch clamp hand tool, extreme versatility, for connections in combination with pex b barb fittings within pex b piping systems, compatible with 3/8", 1/2", 3/4" & 1", led indicator visually confirms complete connection, compact design allows for ease of use in tight spaces & manifold installations, ratcheting design reduces incorrect connections, for use with apollo, murray & oetiker pex b stainless steel pinch clamps, do not use with zurn quick clamp, do not use this ratcheting tool to remove pinch clamps, conforms to astm f2098 standards, 2 year warranty from date of purchase & when used in accordance with instructions.