3.7 HP 155 PSI V-Style Single Stage Cast Iron Air Compressor Pump Compression. Upgrade your air compressor with this 3.7 HP V-Style Single Stage Cast Iron Air Compressor Pump. Perfect for 240V, 3.0 HP to 3.7 HP applications, it’s a direct replacement featuring a 155 PSI capacity. Designed to fit compressors with an 8-3/8″ L x 4-5/8″ W bolt pattern, it includes compression fittings for 3/8″ or 1/2″ outlet tubes. Plus, it comes with an extra fitting and gaskets for future maintenance. Compatible with motor pulleys of 3.6″ to 3.85″. Cast iron cylinders for durability. Automotive-style ball bearing and stainless steel reed valves for reliability. Pleated air filter with metal canister for efficient filtration. Aluminum head and finned cover for heat dissipation. Requires A-width, V-style belt (not included). Oil reservoir (oil not included). 155 PSI max working pressure.