Waterproof USB Rubber Cap Silicone Plug

A USB Rubber Cap intended for water exclusion has to work with the device housing around it. The connector opening and the surrounding perimeter can present different contact surfaces. Define which surface the rubber is meant to close before selecting the inserted depth or head dimensions.

Trace the boundary around the seated cap. A housing recess, joint or neighboring feature may leave a path outside the area touched by the rubber. Pressing the cap deeper into the connector does not resolve such a path and can interfere with internal features. The design should provide closure contact without relying on pressure against electrical contacts.

Select the silicone formulation for the exposure and care conditions, then evaluate the complete device with the cap fitted in its intended position. Include the actual housing and nearby openings in that assessment. The cap alone cannot establish the performance of the enclosure.

After removal for cable access, keep its mating surfaces clean. Recheck the perimeter when refitting, especially if the housing has been serviced. Replace damaged rubber with the defined configuration rather than changing insertion force to compensate for a disturbed closure surface.

Material options

Custom silicone compound; formulation and geometry developed together.

Hardness selection

Silicone options: 20–80 Shore A. The design should provide closure contact without relying on pressure against electrical contacts.

Custom geometry

Define which surface the rubber is meant to close before selecting the inserted depth or head dimensions.

Fit evaluation

Include the actual housing and nearby openings in that assessment.

Color & OEM

Custom colors; identification clear of connectors and removal features.

Photos illustrate structure or material appearance only. The connector opening and the surrounding perimeter can present different contact surfaces. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.