These 1/4" compression fittings are NEW TECH made from 304 stainless steel. They connect to 1/4" main supply hose and operate leak-free. Old school push-to-connect drips like mad and hardlines are an expensive and impractical burden. The same security is had with this solution while convenience and value are much greater. These bits directly replace older fittings. They work with the same tubing, solenoids, and other plumbing elements.
Conventional in appearance, these are actually two pieces that thread together with the hose secured in between.
Assembly is as easy as it looks. Pass the tubing through the nut and then force it over the barb. Next, tighten the nut on top of the bulged line with hard finger torque. Secure with weak thread locking fluid, if you please.