Made of tough, high-impact plastic. Three openings: 1-1/4″ fill inlet, 3/8″ outlet and 3/8″ vent. Non-toxic, food grade, polyethlene construction. Tasteless and odorless. Cannot rust or corrode. Lightweight, half the weight of comparable galvanized tanks. The tank is 12″ x 12″ x 32″. Tank kit includes the following parts: Tank; 1-3/8″ ID vinyl tube 6-1/2″ long; 3-3/8″ HB x 1/2″ MPT adapter; 1-1/4″ x 24″ flexible water intake hose and 1-1/4″ MPT x hose barb.