4.5" Double Groove A Section 4L Sheave with 5/8" (0.625") H-Style Split Taper Bushing - 2AK46H 6.5" This belt measures 5/8" wide

This belt measures 5/8" wide x 70" long outside diameter

There is a built in muffler in the exhaust air port to quite down the unloaded air that is released once the compressor reaches 125 PSI

If you are not sure this is the right part

to control the throttle on a gas engine and/or unloader valves on some pumps

4.5" Double Groove A Section 4L Sheave with 5/8" (0.625") H-Style Split Taper Bushing - 2AK46H 6.5" This belt measures 5/8" wideCast Iron 4. 5" 2 Groove Dual Belt A Section 4L Pulley With 5 8" Sheave Bushing Masterdrive 2 Piece dual groove 4. 5" cast iron pulley sheave with 5 8" H bushing for A section belts. This is a high quality 2 piece pulley that measures 4. 5" outside diameter and is designed to be used with an H style bushing. This 5 8" bushing (Included) inserts into the center of the pulley and slides over the shaft. As you tighten down the bolts on the H bushing it