Bus AC expansion valve block with service port. Used in ACT systems. Liquid inlet 3/8", Liquid outlet 1/2". Suction inlet 5/8", Suction outlet 5/8". Used in in-wall evaporators on shuttle buses, school buses. We sell more than bus air conditioning parts. Please browse our store for all of your shuttle bus parts needs. We carry the most commonly used air conditioner compressors for shuttle bus applications. Check out our ac compressors.