Ask This Old House — Episode 18: Tree Pruning; Installing a Shower Mixing Valve

You are watching the episode Tree Pruning; Installing a Shower Mixing Valve Landscape contractor Roger Cook shows a homeowner how to prune her neglected crabapple tree properly. Then Roger, along with host Kevin O'Connor, general contractor Tom Silva and plumbing and heating expert Richard Trethewey ask, "What is it?" Later, Richard helps a homeowner install a new "anti-scald" shower-mixing valve.