Model TAC, TAC2 and TAC3 air valves may be operated by pilot, mechanical or solenoid operators or manually operated by their push-buttons. Each push-button's shoulder bottoms-out on the valve body to prevent overstroke and valve damage. Operators adapt directly to the threaded button end on push button valves. The push button itself is constructed of work-hardened stainless steel. Appropriate lock-nuts and lock-washers are furnished.