Thermostatic Bathtub Faucets valves accomplish the same thing by detecting changes in temperature. Until recently, scald security was available only in single-handle taps. The new Observe II from Delta is the first two-handle drain that offers it. Many areas have "scald codes" that require scald security in all new construction. Even if your town doesn't have this Bathroom Accessories requirement, antiscald security is vital for children and seniors. Shower faucets with scald security usually start at around $150.