Square pipe plug/ silicone rubber rectangular sheath

A square pipe plug closes the end of a shaped tube with a profile adapted to its internal opening. A silicone rectangular sheath variant covers an outside profile instead. The receiving surfaces differ, so the inside dimensions for a plug and outside dimensions for a sheath should be established separately.

Tube corners are not always perfectly sharp. Their radii, wall thickness, and any internal seam affect how the rubber fits, even when the nominal side dimensions agree. Measure the finished tube end and account for the full region that will engage the closure. An inserted body should not stop against a seam before the head reaches its intended seat.

Remove cutting burrs before fitting and align the long and short sides correctly on a rectangular version. The closure should follow the tube profile without one corner remaining stretched or lifted. Choose material and hardness for the tube's use environment and the desired handling method. If the end piece will contact another surface in service, assess that contact role separately from its ability to finish the open tube end.

Material options

Custom silicone compound; formulation and geometry developed together.

Hardness selection

Silicone options: 20–80 Shore A. The closure should follow the tube profile without one corner remaining stretched or lifted.

Custom geometry

The receiving surfaces differ, so the inside dimensions for a plug and outside dimensions for a sheath should be established separately.

Fit evaluation

Remove cutting burrs before fitting and align the long and short sides correctly on a rectangular version.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. An inserted body should not stop against a seam before the head reaches its intended seat. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.