VT4-SH Noritz 4" Hood Termination for Single Wall Stainless Steel Venting The VT4-SH 4" diameter stainless steel hood adds a professional and important component to your vent pipe termination. This hood helps protect your piping and tankless water heater from the elements while adding a strong durable component to a location susceptible to damage.  High temperature rated stainless steelEasy to install Quick-snap connectionUnique gasket enables tight seal