Check the listing for details. American Standard M952100-0070A/H Pressure Balancing Unit for Tub and Shower. Condition: New. Listed at 13.01 USD. The American Standard M952100-0070A/H Pressure Balancing Unit for Tub and Shower is a two-piece set designed for use with American Standard brand fixtures. This 45° elbow-shaped unit is made of plastic and rubber materials, with a brushed brass finish. It features a 1.2-inch exterior diameter and a 0.5-inch interior diameter, making it suitable for use with boilers. The pressure regulator unit has an electric feature and weighs 2.4 ounces, providing a convenient and efficient solution for maintaining water pressure in your tub and shower system.The American Standard M952100-0070A/H Pressure Balancing Unit for Tub and Shower is a two-piece set designed for use with American Standard brand fixtures. This 45° elbow-shaped unit is made of plastic and rubber materials, with a brushed brass finish. It features a 1.2-inch exterior diameter and a 0.5-inch interior diameter, making it suitable for use with boilers. The pressure regulator unit has an electric feature and weighs 2.4 ounces, providing a convenient and efficient solution for maintaining water pressure in your tub and shower system.