I’m not sure that I have used any push lock, but my memory really sucks anymore. Many of them have a radiator adapter that you slide the hose over a flare fitting and clamp it. The coolers have barbed fittings for the hoses.
Back in my youth when I was young & stupid (not young anymore), I remember just sliding hose on a cut steel line to install one. Came back off & made a real mess. Made a real impression on me, so I have been careful on installs since. Most of mine have been on vans & sedans that I towed a trailer with. Would be better all hard plumbed in I suspect, but on daily driver boring cars I have never had the urge to make it too special.
