expansion tank

In an expansion tank (glass container with an accurate volume scale) with the sample liquid.

The expansion tank is simply a metal container filled with water and air.

In new and upgraded systems, expansion tanks are used more frequently than in the past.

The engine cooling system was also modified for the September 1967 upgrade, and no longer incorporated an expansion tank.

Does it, perhaps, come from the expansion tank in the loft?

During the course of the work, I mentioned casually that I had been having problems with the expansion tank.

He popped out to the truck and brought in a new expansion tank.

At the end of four hours I had two new circulators and a new expansion tank.

Plumbing and heating contractors have told us that we needed a new expansion tank, which we added.

Such vessels often are called accumulators or expansion tanks.