Wates 60 Liter Pressure Tank 10 Bar for use with Pressure Boosting Sets mainly for Domestic Pressure Boosting and Light Commercial Use. Wates Pressure Tank is constructed of a virgin polypropylene liner combined with an FDA-approved high-grade butyl diaphragm. This is held against the wall of the tank with a steel clench ring. The brass air valve, sealed by a threaded o-ring valve cap, prevents air leaks.