Product Details: Update your semi with reliable new O-rings and washers, with the OTR Heavy Duty A/C Sealing Washer / O-ring Box Kit with Expertise Built In™. Thanks to its durable composition, each set is designed to withstand temperature changes and chemical exposure without degrading, while efficiently sealing the AC system. Manufactured with precise measurements to prevent gas, air, or fluids from escaping. The air conditioning and heating system in heavy duty trucks has a major impact on drivers’ safety and comfort level. Whether you are looking for A/C compressors, condensers, driers, freon, or blower motors, FleetPride has the part you need to make sure your air conditioning and heating are well maintained. Keep your heavy duty fleet operations working as productively and efficiently as possible by finding the right air conditioning and heating part for you. FleetPride is your First Click in Heavy Duty®.