Rectangular rubber plug for hole sealing

A rectangular rubber plug closes a matching opening with a profile that has distinct sides and corners. The corner radius matters alongside overall length and width: a plug can meet the straight edges while binding at the corners, leaving part of the closure raised.

Measure the cutout shape and wall thickness at the intended engagement area. Check the inserted depth against any internal obstruction and allow clearance around the head or flange. If the opening is formed in a thin panel, the retaining profile needs to suit that thickness rather than relying only on an interference fit along the long sides.

Install progressively and inspect all four corners for folded material or incomplete seating. Do not force one raised corner down without checking the cause of interference. Sealing performance must be assessed in the finished joint under its intended exposure. During reuse, examine the corners closely because concentrated handling and local strain can begin damage there before the broader straight sections show an obvious change in condition.

Material options

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

Hardness selection

Solid rubber options: 30–90 Shore A. Install progressively and inspect all four corners for folded material or incomplete seating.

Custom geometry

The corner radius matters alongside overall length and width: a plug can meet the straight edges while binding at the corners, leaving part of the closure raised.

Fit evaluation

Measure the cutout shape and wall thickness at the intended engagement area.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. A rectangular rubber plug closes a matching opening with a profile that has distinct sides and corners. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.