Tube size : 1/4", 3/8", 9/16".
2-pattern sealing type. (O-ring type, Ball type). 
O-ring for easy replacement and ball replacement-type check.
A valve using stainless steel 316 cold material for preventing reverse flow. 
A valve that facilitates one-directional movement by blocking the reverse flow of gas or liquid. 
Cone and thread connection to prevent gas or liquid leaking. 
Excellent corrosion resistant.