Replaces many Trane, American Standard OEM compressors. Designed with large internal open area to reduce liquid hammering. Entirely suction cooled, no external cooling required. Built for long lasting, transient tolerant performance. Tripod mount on 1 and 2 cylinder models (up to MTZ80). 9.7" square mount 4 cylinder MTZ100 and larger. Rotolock connections; sweat spuds provided. Charged with POE oil. Must order MTZ models for use with HFC refrigerants.