Pressure reducing valve; problems with crown molding

Plumbing and heating expert Richard Trethewey helps a homeowner with very high water pressure by installing a "pressure reducing valve." Landscape contractor Roger Cook is joined in the ASK THIS OLD HOUSE loft by turf expert Mary Owen to discuss which types of grass are appropriate for certain climates and conditions. Roger and Richard, along with host Kevin O'Connor and general contractor Tom Silva ask, "What is it?" Tom helps a homeowner who had problems installing crown molding on his kitchen cabinets.