2019 kenworth t680 push to connect brass air line fitting o-ring replacement

Looks like you’re dealing with the push-to-connect fittings on a Paccar system. Those blueish-black O-rings might be specialized for high heat or specific chemical resistance. Standard O-rings might not cut it if they’re not rated for those conditions. I'd check Paccar or the compressor manufacturer for exact specs. Also, as for airline kits, I usually grab mine from NAPA or FleetPride—they’ve got decent universal kits that include O-rings and fittings.

 

Yeah, I’ve seen those same o ring kit on Northern Hydraulics setups before. They’re usually high-temp silicone or a special nitrile blend. Standard O-rings won’t hold up - trust me, tried it once, ended up with a leak three days later. I’d say hit up their dealer.