Plumbing has been simplified with a choice of multi-port check valves from Industrial Specialties Mfg. Inc., of Englewood, Colo. Used to control flow in the lines of vacuum or pressure by permitting flow in one direction and preventing flow in the opposite direction, these valves will operate in any orientation and can also be used for liquid service. Check valves are manufactured with nylon bodies and fluorosilicone seals. Standard barbs are available in 3/16″, 5/16″ and 1/4” I.D.