Anti-Suckback Valve Disc, Leybold, Trivac, Part# PL40050137 – vacstellar

The Anti-Suckback Valve Disc, part number PL40050137, is a simple but vital part inside your Leybold Trivac pump. Think of it as a tiny, one-way door for oil. When your pump is running, everything flows normally. But when the pump stops, this disc snaps shut.

Its job is to block the path. It prevents pump oil from being sucked backward into the inlet line or even into your valuable vacuum chamber. This “suckback” can create a big mess. More importantly, it can contaminate your work and damage other equipment.

Replacing this disc is a standard part of good pump care. If it becomes worn or damaged, it can’t seal properly. You might notice oil where it shouldn’t be after shutdown.

This is the official Leybold part. It is made to the exact size and specification for a perfect fit. Using it ensures your Trivac pump stays clean and safe inside.

If your pump model is on the list, keeping this disc in good shape is a smart, easy way to avoid bigger problems.