Piloted non-return function pneumatically-actuated check valve - Festo (HGL series) - Part number #530033 - G1/2" threaded pneumatic connection (port 1) + G1/2" threaded (male) pneumatic connection (port 2) + G3/8" threaded pneumatic connection (pilot air port 21) - Rated for 1600L/min (LPM) (standard flow rate qnN at 6bar-5bar) - Screw-in mounting - Die-cast zinc swivel connection / NBR seals - equivalent to part #HGL12B