T-Adapter Size: The bidet T-adapter has a 7/8"-7/8"-3/8" thread size (also known as 15/16"-15/16"-9/16"). The 15/16" female thread connects to the 7/8" toilet tank, the 15/16" male thread connects to the 7/8" water supply pipe, and the 9/16" male thread connects to the 3/8" metal bidet pipe. High-Quality Material: This bidet T-adapter is made of solid brass, which is corrosion- and rust-resistant, sturdy, and leak-proof. The metal bidet T-valve offers far superior performance and durability compared to plastic. Measuring the Size: To determine the correct size, you can use two methods: measure the outside diameter of the water tank thread (approximately 23 mm) or check the size markings on the water supply pipe. A common mistake is assuming that the measured outside diameter is equal to the thread size, leading to incorrect orders. Always check both methods to ensure compatibility. Widely applicable: The 3-way T-fitting is a multifunctional solution that easily splits the water supply into separate channels. Designed for convenience and compatibility, this fitting fits most toilet tanks and bidet accessories with hot and cold water systems. Note: Some bidets and toilets come with this adapter; check before ordering. Easy to use: No plumber or tools required. Quick and hassle-free installation with all accessories included in the package. By following the installation manual, the job will be completed in minutes.