Teco US TR20 - Manual (Page 4)

Unscrew the Ring Nuts and remove the shut off valves from
the chiller.
Use channel lock pliers or similar to loosen plastic nuts
holding the housing in place. It is not necessary to grip nuts
tightly, a loose grip will help prevent scarring of plastic. If
desired, a piece of duct tape may be used to cover the teeth of
the channel lock pliers to prevent scarring of the plastic nuts.
Once loosened, manually remove the plastic nuts.
Step 1
Removing The Shutoff Valves