Ingersoll Rand 666057-2A4 Double Diaphragm Pump

The Ingersoll Rand ARO 666057-2A4 is a 1/2-inch, classic-style non-metallic diaphragm pump that operates as an air-operated double-diaphragm (AODD) unit, designed for compact-space liquid transfer. This preowned model uses a PTFE/Santoprene diaphragm and a stainless steel ball and seat in the fluid end, aligning with Ingersoll Rand ARO specifications for chemical compatibility and reliable sealing. As part of the Classic Style Compact Series, the 666057-2A4 offers a lightweight, non-metallic construction with a small footprint that suits installations where space is at a premium while handling liquids compatible with PTFE/Santoprene diaphragms. Repair and maintenance options exist through ARO/Ingersoll Rand parts catalogs, including referenced repair kits such as 637140-A4, indicating ongoing availability of replacement components to extend service life. Because it uses a standard ARO diaphragm and fluid-end design, replacement diaphragms and repair kits are widely available from distributors, supporting ongoing maintenance for preowned units.