ROmate reverse osmosis permeate storage vessels from Pentek reduce costs while maintaining quality. ROmate-15 is a 14.5 gallon Reverse Osmosis Tank. Structural ROmate-15 Storage Tanks have a polyethylene inner shell and a fiberglass exterior. ROmate-15 Fiberglass Storage Tanks feature 100% Seamless construction and the ability to discharge in any position. ROmate-15 storage tanks feature a removable air cell which allows for easy service and sanitation or replacement as needed. ROmate-15 Storage Tanks are pre-charged at 10 PSI.