**4385-514AD MINNESOTA RUBBER QUAD RING

The VQ4385 is an AS568-385 black Viton® (FKM) 75 Shore A quad profile Quad-Ring built to an inside diameter of 15.955 in (405.26 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 16.375 in (415.93 mm). This quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

This material stands up to chlorinated solvents, engine and transmission fluids, and aromatic hydrocarbons. Viton® (FKM) is specified for long service life in hot, chemically aggressive environments and the industry benchmark where nitrile reaches its thermal limit. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). Exposure to amines or hot water and steam will shorten service life.

Maintenance and OEM teams specify it across chemical processing, high-temperature process equipment, and semiconductor equipment.

Stocked as VQ4385 and sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.