Do you have any compression fittings? If you do you can undo the one end and put a brass cap on it. I ran copper tubing from the elbow off the block up towards the firewall. Before it enters the cabin I have a compression fitting to join the copper with the plastic line.

-'96 SE MTX 3L -'98 SVT 1,173 of 6,535 -'05 Mazda 6s, loaded, g/f's ride -Need a 96-00 manual on CD? PM or email me