Return line filters are available in port sizes from 1/2 to 1 1/4 in. They feature an aluminum alloy head and cover, polyamide bowl and bypass valve, and nitrile seals. They are rated for flows to 65 gpm with 10 µm cellulose element and operate in temperatures from -15° to 23° F and maximum working pressures to 100 psi. Hydro-Craft Inc., (248) 652-8100,