Rubber Grommet (1/2")

Mulberry CWD77-BOX – 1/2" Rumsey Rubber Grommet for Conduit and Panel Sealing Applications

The Mulberry CWD77-BOX is a 1/2 inch Rumsey-type rubber grommet used to seal and protect conductor, tubing, or piping penetrations in metallic or non-metallic enclosures. Manufactured from resilient elastomeric rubber, this grommet helps maintain system integrity by providing a clean, friction-resistant opening through panels, electrical boxes, or junction enclosures.

Its compression fit design ensures a secure installation in pre-drilled 1/2 inch diameter holes, reducing edge abrasion and minimizing the risk of damage to inserted materials. Commonly used in indoor dry-location assemblies or environments where light sealing and strain relief are required, this component supports code-compliant wiring practices and enclosure penetrations.

Product Features

• ✅ Nominal Diameter: 1/2 inch – Sized for standard panel knockouts or conduit stubs.
• ✅ Material: Flexible, oil-resistant rubber compound designed for mechanical sealing in utility-grade installations.
• ✅ Application: Seals penetrations in electrical boxes, conduit entries, or panel cutouts to reduce chafing and dust ingress.
• ✅ Install Method: Press-fit into knockout or bored panel hole without adhesive or threaded hardware.
• ✅ UL Recognition: Designed to meet general enclosure component protection needs where a watertight rating is not specified.

Installation Considerations

Grommet is installed manually by pressing into a clean, properly sized hole. No tools are required, though minor assistance with a flat-blade tool may help in confined areas. Ensure hole edges are free of burrs prior to installation. For conductors or pipes passing through, verify outer diameter compatibility with the grommet inner bore to avoid excess compression or movement.

Typical Use Cases

Commonly deployed in electrical distribution panels, device enclosures, transformer boxes, and HVAC control cabinets. Frequently specified for AC cable or tubing entries where vibration isolation or edge protection is necessary. Can also be used in low-pressure utility plumbing boxes where sealing around tubing or risers is required.