Rolair PMP12MK103 Air Compressor Pump Motor Unit

Rolair PMP12MK103 is a belt-drive, single-stage air compressor pump assembly (MK103) designed to power Rolair systems. In Rolair’s official catalogs it is listed as PUMP, MK103, and is supplied as a dedicated MK103 pump unit that includes a flywheel and an integrated filter. This is a one-stage pump within the MK103 family, engineered to couple with Rolair motors and tanks in compatible compressor configurations and to deliver the standard single-stage compression characteristic used across Rolair’s lineup. The PMP12MK103 designation appears in Rolair’s parts catalogs and pricing literature, confirming its role as the MK103 pump component within the Rolair ecosystem. The belt-drive layout emphasizes a compact, robust pumping mechanism that can be serviced independently from the motor, making it a common replacement or upgrade part for Rolair machines that require the MK103 pump stage. When installed as part of a Rolair system, this pump assembly provides the essential mechanical stage that enables air production, with the included flywheel helping to balance operating speed and belt drive performance and the integrated filter contributing to air quality at the point of compression.