*4331-514AD MINNESOTA RUBBER QUAD RING

APG stocks the VQ4331, an AS568-331 black Viton® (FKM) 75 Shore A Quad-Ring measuring an inside diameter of 2.225 in (56.52 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.645 in (67.18 mm). A quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

Viton® (FKM) is specified here for long service life in hot, chemically aggressive environments and outstanding high-temperature capability. This material stands up to chlorinated solvents, aggressive chemicals, and petroleum oils and fuels. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). Applications involving amines or hot water and steam call for a different compound. The profile itself contributes lower compressive load required to achieve a seal and a parting line located away from the sealing surface.

It sees regular use in aerospace, semiconductor equipment, and automotive fuel systems.

Order part number VQ4331, sold individually. Nominal inside diameter is listed as 2 1/4. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.