Synopsis

Plumbing and heating specialist Richard Trethewey travels to San Francisco to assist a homeowner with the repair of a vintage shower mixing valve. Afterward, Trethewey joins host Kevin O'Connor, landscaping contractor Roger Cook, and general contractor Tom Silva as they ponder, "What is it?" Later, in the loft, Kevin and Tom are joined by battery expert Tim Pugh to explore battery technology in cordless tools and the correct methods for recycling batteries.