The TE Connectivity / Raychem Brand part 381A301-51/164-0 is a heat shrink transition Y style polymer in a durable black bag/box packaging. This heat shrink product is designed to provide reliable and lasting protection for electrical connections. It features a Y shape, making it suitable for branching or connecting multiple wires or cables. The heat shrink material effectively insulates and seals the connection, providing resistance to moisture, chemicals, and other environmental factors. With TE Connectivity's trusted Raychem Brand, you can be confident in the product's quality and performance.