Choose Options Quick view 300188 300225 P8903-42 - Tri-Star Inc. Millivolt Combination Gas Valve As low as $167.99 This is a New Robertshaw Replacement 700 Series Millivolt Combination Gas Valve. It is rated at 300,000 BTU, has a 3/4" Inlet and outlet and comes with two 1/2" reducer bushings. It replaces the... As low as $167.99 Choose Options Quick view