SNSUnion Cross Type plastic push to quick connect tube fitting 1/4" Tube OD(10 PCS) SPXL-1/4

These are high quality push connect fittings that work well with garden irrigation systems.

This is for the quad connectors. I have written reviews of these SNS connectors in their various configurations before, so I won't repeat myself. I would add that these connectors require both a push in AND a pull out motion to not leak upon reconnect -- not just push in. I indeed use them for low-pressure water irrigation lines (20-40 PSI), but water and air would be no different as it applies to leaking in general. Otherwise, it's a good product that suits the need and I would buy them again.