uxcell Push to Connect Tube Fitting Adapter 6mm Tube OD x 1/4 NPT Female Straight Pneumatic Connecter Pipe Fitting - AliExpress
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6mm x 1/4'' NPT Push-in Fitting with Male Threads Stainless Steel FKM | Tameson.com
Push to Connect Tube Fitting Adapter,6mm Tube OD x 1/4 NPT Female Straight Pneumatic Connecter Pipe Fitting 2pcs - Walmart.com