The T&S Brass B-23K is a Spring Check Spindle Assembly Kit designed for reliable faucet performance. This kit includes one right-hand and one left-hand Eterna cartridge, each equipped with a spring check mechanism. The Eterna cartridges ensure smooth operation and durability, making them ideal for high-use environments. This assembly kit is essential for maintaining optimal faucet functionality and preventing backflow, ensuring a consistent water flow. Upgrade your faucet with the T&S Brass B-23K for enhanced efficiency and longevity.