Well I got the 131EN mig welder and had to order the gas regulator adapter. I got that in the mail today and am not sure how to install it. It looks like a quick connect fitting and screws on the regulator, but not sure how the hose connects? Came with a little washer that looks alumnim. I am guessiong it goes in the part tha screws on the regulator? Can anyone help me here wiht some instruction?