The T&S Brass B-23K-NS Spring Check Spindle Assembly Kit - (1) right & (1) left hand Eterna cartridge with spring check - is an essential component for plumbing systems requiring precision and reliability. This assembly kit includes both a right-hand and a left-hand Eterna cartridge, each with a built-in spring check feature. These cartridges are integral for maintaining a consistent and leak-free flow in various commercial and industrial water applications. The spring check mechanism ensures a secure seal, preventing backflow and potential contamination. This feature is particularly valuable in environments where water safety and efficiency are paramount. The T&S Brass B-23K-NS kit is designed for ease of installation and compatibility with existing systems, providing a straightforward upgrade to enhance operational performance. With a focus on durability and engineering excellence, this spindle assembly kit is an ideal choice for professionals in the plumbing industry seeking dependable components for their projects. The T&S Brass brand is recognized for its commitment to quality, making this kit a reliable addition to any commercial plumbing setup.