Watts Aqualock 1/4" Copper Tube Size PEX Quick Connect Pipe Tee. It is a 1-piece fitting with no parts to assemble or lose, ensuring a secure connection. It is code-approved for behind-wall without access and direct in-ground burial installations, making it suitable for various plumbing applications. This tee is NSF-14, NSF-61, CSA/ASTM, and UPC code listed and approved, meeting industry standards for safety and reliability. It serves as a replacement for Qest and Flare It type fittings. The push fittings can withstand up to 250 psi, ensuring durability and longevity.