This relay valve is a direct replacement for Bendix 286370 and 286371 models. It features a 1/4 inch NPT service port, 3/4 inch supply ports, and a 1/2 inch NPT with (1) 1/4 inch NPT delivery ports. The balance port, located under the exhaust cover, is 1/8 inch NPT. With a cracking pressure of 3 psi, this valve is practical and reliable. It fits most makes and models, making it a versatile choice for various applications. Sold individually, this relay valve is a convenient solution for your needs.