Busch Shaft Seal, Buna – 30 x 40 x 7 mm Part# 487000140 – vacstellar

This Busch replacement seal is your fix. Its job is simple but vital. It fits tightly around the pump’s spinning shaft. On one side, it keeps the pump’s lubricating oil safely inside. On the other side, it stops outside air from getting in. Proper lubrication is the lifeblood of your vacuum pump. A leaking seal leads to low oil levels. This can cause overheating and serious damage to internal parts. It also makes a mess in your workspace.

This seal is made from Buna-N (Nitrile) rubber. This is a special material. It is excellent at resisting oil and handling the pump’s operating temperature. It stays flexible and creates a dependable seal.

The seal’s dimensions are 30 mm inside, 40 mm outside, and 7 mm thick. It is the exact OEM size (Part # 487000140) for specific Busch models.

Replacing a worn shaft seal is a key part of pump maintenance. It restores a tight seal and protects your investment. We recommend this task be performed by a qualified technician to ensure proper installation.