This single check valve with 1/4 inch threads is a practical replacement for Bendix 229603 and 800375. Sold individually, it fits most makes and models, making it a versatile and cost-effective solution for your needs. With its durable construction and easy installation, this check valve offers a reliable and efficient option for your vehicle's air brake system. Whether you're a professional mechanic or a DIY enthusiast, this product provides a convenient and reliable solution for your maintenance and repair needs.