High-quality material: The air conditioning safety valve is made of high-quality brass, which is high-strength, corrosion-resistant, rust-proof, durable and long-lasting. Perfect size: Brass flow control valves are available in the most common connection sizes from 1/4" to 5/16". Easy to use: The air conditioner flow control valve is easy to use with a top-loading knob and a swivel for convenient flow adjustment. No matter what position the safety valve is in, the operation can be easily changed. Strong practicality: The thickened flow control valve can accurately control the high and low pressure valve needles of the air conditioner, which is safe and convenient to avoid burns and refrigerant leakage, and can be easily replaced.