The CBX expansion tank from Taco, Inc. (Cranston, RI) is designed for vertical installation and uses a seamless, molded butyl bladder that prevents the possible loss of tank precharging pressure due to leaking at vulcanized seams, according to the manufacturer. The tank is available in 13 models ranging from 4 to 160 gal, and is designed with 125 or 150 psig working pressure with maximum temperatures from 240 degrees F.