Suction/Return Flanges and Grommets are designed to seal pipe or tube lines when passing through the top plate of a hydraulic reservoir or similar applications. Suction Flanges also allow access for removal of a suction element for inspection without draining the reservoir. Standard Features: Top and bottom mounting plates Internal washer the seals against the pipe/tubing and between the top/bottom plates Gasket to seal between the bottom plate and the reservoir top plate on suction flanges. Return flanges use the internal washer seals the flange to the reservoir top plate (4) 5/16-18 thread forming screws on suction flanges (2) 1/4-20 thread forming screws on return flanges