Custom waterproof silicone plugs/rubber caps/rubber cover

Waterproof silicone plugs need contact that remains continuous while the closure stays in its intended position. The sealing band and retaining region may be separate features, so both should be matched to the actual opening. A plug that feels secure during insertion still needs assessment of the completed connection under its relevant water exposure.

Define the inserting profile, depth, and exposed handling area. Cap versions cover an outer feature and require their own internal dimensions. Select the silicone formulation for the actual temperature, water conditions, and cleaning substances at the location.

Fit on a clean seat without folding the contact edge. Inspect after adjacent hardware is installed so nothing presses or pulls the exposed portion out of position. During servicing, keep residue away from the contact band and check for cuts or persistent distortion. If the closure no longer seats consistently, investigate the receiving geometry and material condition instead of forcing it deeper to create an uncontrolled new contact region.

Material options

Custom silicone compound; formulation and geometry developed together.

Hardness selection

Silicone options: 20–80 Shore A. Define the inserting profile, depth, and exposed handling area.

Custom geometry

Cap versions cover an outer feature and require their own internal dimensions.

Fit evaluation

Inspect after adjacent hardware is installed so nothing presses or pulls the exposed portion out of position.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. A plug that feels secure during insertion still needs assessment of the completed connection under its relevant water exposure. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.