waterproof pipe plugs/molded high quality Buna-N seal caps/stopper

Buna-N seal caps can be custom molded around a pipe end or another matching closure interface. The compound should suit the actual medium and temperature, while the internal shape needs to follow the surface that retains the cap. Diameter and engagement length should be considered together.

Check the end for a shoulder, lip, or change in section that affects how far the cap can travel. A cover may grip at the entrance yet stop before reaching its intended seat. Leave enough accessible material for removal if the opening is used during servicing.

Clean the mating area and examine its edge before fitting. Seat the cap evenly without turning its mouth inward. Water-related or pressure service must be established for the complete pipe assembly rather than inferred from the flexible cap alone. During maintenance, inspect the contact section for swelling, cuts, or permanent distortion. Select a replacement with the required compound and internal profile so that it reproduces both the seated position and the intended engagement on the pipe.

Material options

Rubber compound options, customized alongside the profile and contact conditions.

Hardness selection

Solid rubber options: 30–90 Shore A. Water-related or pressure service must be established for the complete pipe assembly rather than inferred from the flexible cap alone.

Custom geometry

Diameter and engagement length should be considered together.

Fit evaluation

Check the end for a shoulder, lip, or change in section that affects how far the cap can travel.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. Diameter and engagement length should be considered together. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.