No matter the condition of your 1973 GTO, OPGI has the Valves, Check & Shutoff products you need to boost performance and get you back on the road. We currently carry twelve Valves, Check & Shutoff items to choose from for your 1973 GTO, and our Price Match Guaranteed prices range from as little as $3.99 up to $115.99. OPGI offers CPP plus four other trusted brands of Valves, Check & Shutoff products for your 1973 GTO, to help you find quality parts you can rely on. With OPGI's 45-day return policy and thousands of customer reviews, you can shop with the utmost confidence. Enjoy parts delivered directly to your home, or visit our sunny Southern California Showroom & Warehouse to check out our Valves, Check & Shutoff items in person.