1/8 PT Female Thread Air Gas Water Non-return One Way Check Valve 4Pcs Product Name : One Way Air Check Valve;Color : Silver Tone Thread Size : 1/8 PT;Thread Diameter : 8.5mm Size : 37 x 12mm/ 1.45" x 0.43" (L*D);Material : Metal Weight : 84g Package : 4 x One Way Air Check Valve