Thank you for all of your help! Finding it was easier to work on the lines by removing a dummy wall under a closet instead of working through a stupid 4"X7" opening they provide. You were right it was the back flow, it had shot apart into the line. Hubby had everything drained, removed what he could & blew the rest out with the compressor after he had removed the line at the other end. Plus from this ... we now have a removable panel :B ... the con ... answering why I have sooooo many craft things hidden away! :W