Review on Push To Connect Air Fittings 1/2,CEKER PC 1/2 Inch Od Tube X 1/2" NPT Male Thread Air Line Quick Connect Air Hose Fittings Pneumatic Fitting Push Lock Fit Connector 2Pack by James Collins

I used these on a Dewalt compressor to replace the single output and install a manifold around the side. I attached two of these with 3/8 (1/2 OD) standard Pex-B. So far it's flawless. Just be sure to cut your Pex FLAT. As with any pipe if the edge isn't flat you're going to compromise the seal with this type of fitting. These work great! When I pipe the whole garage I'll buy more of these.