4" ID X 4-3/8" OD X 3/8" HT

The L18704000375B is a Polyurethane (AU/EU) Type B Loaded Lip Seal built to a 4 inch inside diameter, a 4-3/8 inch outside diameter, and a height of 3/8 inch. This loaded lip seal combines a preloaded lip with pressure activation for consistent dynamic sealing. Supplementary detail from the product record: Loaded Lip Seal (type B) Urethane.

As a material, Polyurethane (AU/EU) is specified for toughness that outperforms conventional rubber compounds and long wear life in dynamic reciprocating service. The compound resists extrusion under high pressure, petroleum oils, and ozone. Applications involving acids and bases or ketones call for a different compound.

Typical settings include hydraulic cylinders, mining and heavy equipment, and press and forming equipment.

This item is sold individually under part number L18704000375B. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.