Black rubber hole plugs/nitrile -butadiene rubber stopper

Black rubber hole plugs close openings with a custom molded body. The nitrile-butadiene compound should be selected for the actual medium and temperature, while the profile follows the receiving bore. The black appearance can coordinate with a dark assembly without changing the dimensional requirements.

Check the opening at the intended seating depth, including any taper or internal step. A visible head that covers the hole may conceal a body that is too loose or too short. The accessible portion should permit the planned removal method without requiring a sharp tool against the sealing surface.

Fit the plug into a clean, smooth opening and inspect for tilting or uneven compression. Do not push it farther in to compensate for an unsuitable diameter. During reuse, examine the rubber for swelling, cuts, or permanent deformation that changes its fit. The selected nitrile compound is not universally compatible with every fluid, so replacement should preserve the specified material as well as the full profile. Inspect the receiving edge before installing another plug.

Material options

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

Hardness selection

Solid rubber options: 30–90 Shore A. A visible head that covers the hole may conceal a body that is too loose or too short.

Custom geometry

Check the opening at the intended seating depth, including any taper or internal step.

Fit evaluation

Inspect the receiving edge before installing another plug.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. The nitrile-butadiene compound should be selected for the actual medium and temperature, while the profile follows the receiving bore. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.