Natural Rubber stoppers/waterproof rubber plugs

A natural rubber plug provides a custom molded body for closing a receiving opening. The profile should match the bore or recess and the intended insertion depth. Material selection should reflect the actual substances and temperature at the closure rather than the rubber name alone.

Check any taper, shoulder, or internal obstruction that affects the seating area. The visible top needs enough access for the planned removal method, while the inserted body must make the intended contact. An oversized head cannot compensate for an unsuitable fit beneath it.

Fit the stopper into a clean, smooth opening without forcing it beyond the designed position. Inspect the edge for tilting or uneven compression. Required waterproof behavior depends on the complete closure and its exposure conditions, so it should be evaluated with the actual receiving part. Before reuse, check for cuts or permanent deformation and clean the contact surface. Replace a loose or damaged stopper with the matching geometry rather than driving it deeper to recover the fit.

Material options

Natural rubber compound options, customized alongside the profile and contact conditions.

Hardness selection

Solid rubber options: 30–90 Shore A. The visible top needs enough access for the planned removal method, while the inserted body must make the intended contact.

Custom geometry

The profile should match the bore or recess and the intended insertion depth.

Fit evaluation

Check any taper, shoulder, or internal obstruction that affects the seating area.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. The profile should match the bore or recess and the intended insertion depth. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.