40 Pieces 1/8" Bsp Brass Pneumatic Pipe Plug Hex Head Socket Plug Fuel Fitting - Pneumatic Parts - AliExpress
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D-Type Industrial Pneumatic Threaded Plug with Male NPT - Gorman & Smith Beverage Equipment — Gorman & Smith Beverage Equipment
Amazon.com: uxcell Push to Connect Fittings, Cap Style Pneumatic Blanking Plugs, Fit for 6mm Inner Dia. Air Hose Tube Pipe, Plastic, Black, Pack of 20 : Industrial & Scientific