Loctite 545™ Thread Sealants, Hydraulic/Pneumatic Fittings Designed for locking and sealing of metal pipes and fittings. Specially formulated to offer high lubricity for easy assembly and removal. Recommended for fine threaded fittings as used in hydraulic and pneumatic installations and small fittings in general. Suitable for fittings up to 50 mm in diameter, including pneumatic and hydraulic fittings. Contains no fillers or particles that could contaminate system fluids, foul valves, or clog fine filters and screens Pack of 1