The PS1 Expansion Tanks are installed inside the PT Filling Wells. As all double wall tanks in this case have their own filling well, they also get their own expansion tanks. The expansion tanks are made of PEH plastic.
The PS4 Expansion Tank has connections for four double wall tanks. From the interspace in the double wall tank the pipes are led into the expansion tank. The pipes of the expansion tank are installed in the ground in a protection tube. The PS Expansion Tank Systems are available for 2-6 tanks.
