Check Valve - TOOGOO(R) Brass 1/4'' Threaded BSPP Female Full Port One Way Air Check Gas Oil Water Valve Made of Brass material, have corrosion resistance and good flexibility. connected securely and high voltage capability high, tightness and repetition is good, easy installation and maintenance, job security and reliability. Applicable medium: oil, water, gas and other non-corrosive or corrosive media. Material: Brass