Tweco 400 Ultra-Cut(May 2014) - Manual (Page 54)

ULTRA-CUT 100 XT/200 XT/300 XT/400 XT
3-30 INSTALLATION Manual 0-5302
3. Attach all hoses and cables to the back of the DPC-3000 except the Fiber Optic cable which will be covered a little later.
Avoid turning any fittings already mounted in the unit by placing a wrench on it before tightening the hose fitting to it.
Do not connect Fiber Optic cable until later
Art # A-09146_AB
4. Connect hoses from the front of the DMC-3000 where shown below to the torch.
NOTE
One fitting with the notches is left hand thread and the other is standard right hand thread.
Art # A-09147_AB
Do Not Block Vent