4009-514AD MINNESOTA RUBBER QUAD RING

APG stocks the VQ4009, an AS568-009 black Viton® (FKM) 75 Shore A quad profile Quad-Ring built to an inside diameter of 0.208 in (5.28 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 0.348 in (8.84 mm). A quad-ring provides a dual sealing band on each contact face for improved reliability.

Expect good resistance to aggressive chemicals, petroleum oils and fuels, and many acids. That behavior comes from the compound itself: Viton® (FKM) is specified for very low compression set at elevated temperature and long service life in hot, chemically aggressive environments. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). It is not the right choice where low-molecular-weight organic acids or hot water and steam are present.

You will find this material specified across automotive fuel systems, high-temperature process equipment, and semiconductor equipment.

VQ4009 ships individually. Nominal inside diameter is listed as 7/32 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.