A/C Expansion Valve by Santech®. Rear. Block Type. Liquid Inlet: 0.375". Liquid Outlet: 0.5". Suction Inlet: 0.75". Suction Outlet: 0.75". Omega-Santech is your one stop resource for all of your AC climate control needs. They offer a full line of aftermarket auto air conditioning products and systems for all vehicles. Browse Omega-Santech auto air conditioning catalog and select from Omega-Santech large inventory of expansion valves and heater control valves. Omega-Santech offers a wide selection of expansion valves in OEM and aftermarket applications. Omega-Santech stock inventory includes products manufactured by Parker, Fujikoki, Egelhof, TGK, Ranco/Invensys and many others. They stock over 72 thermal expansion valves and 96 block valves for automobile, truck, bus and off-road vehicle applications.