Knipex siphon and connector pliers for traps tube fittings and connectors knipex 81 13 250 these pliers from knipex have been manufactured to a high standard with chrome vanadium electric steel forged oil hardened and are designed for siphons tube fittings and connectors up to 75mm in diameter robust and heavy duty the pliers have 25 adjustment positions and offer fine adjustment to diverse diameters knipex 81 13 250 siphon amp connector pliers for traps tube fittings amp connect