FD90 Series Fuel Check Coupling, Danfoss / Eaton Hansen and Gromelle FD90 Series Quick Disconnect Couplings Socket, 1/4-18

For diagnostic pressure testing work, this socket uses an automatic sleeve so you can push to connect with one hand. It is a flush face, 2 way valved coupler, which helps keep fluid loss low at about 0.10 cubic centimeter and air inclusion low at about 0.02 cubic centimeter.

Once connected, the sleeve lock holds it secure. You push it in one-handed and the sleeve engages automatically, so it's not going to back out on you. The coupling is also rated to connect and disconnect at up to 500 psi, which means it can handle live-line pressure without needing to bleed the system down first. That's the main reason these get used for diagnostic pressure testing on hydraulic systems.

Yes, this FD90 series coupling is designed for diagnostic pressure testing in hydraulic systems.

You can connect and disconnect at up to 500 psi without depressurizing the line first. The self-sealing valve design handles that pressure during both connection and disconnection, which saves a fair amount of time when you're running diagnostic checks on a live hydraulic system.

For diagnostic pressure testing on hydraulic systems, it gives you a quick way to connect and disconnect a test point using a one hand push to connect sleeve. The flush face valving helps keep fluid loss low and keeps air inclusion down during hook up.

It's designed for diagnostic pressure testing in hydraulic systems, so fuel compatibility should be fine, but always verify fluid compatibility with the manufacturer's documentation to be 100% sure.