Watch Ask This Old House Season 6 Episode 25 Online

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