4Pcs 0.31" OD Air Fitting Plug Pneumatic Push In Fittings Connector Blue | eBay
Air Hose Fittings,1/4 Inch NPT Male Plug, Industrial Air Coupler Plug, Pneumatic Air Plug Kit ,Air Compressor Quick Connect (1/4'' FP-NPT) - Walmart.com
Value Collection - 3 Piece 1/4" Body 1/4 NPT 145 psi ARO Pneumatic Coupling Plug Set - 72476294 - MSC Industrial Supply
Pneumatic Pipe Plugs - Hynds Pipe Systems Ltd.
Pneumatic Plug Connector Tube OD 3/16" Plug In Air Tube Fitting 10 Pieces | eBay
Plug Connector, Plug push in fitting, Tubing Stopper