Wide Compatibility: Compatible with models WS1, WS1TC, WS1CS, WS1CI, WS1EE, WS1EI, WS1SP, WS1SQ. Note: The Spacers are Gray on this Standard WS1 version. V3430 are Black and slightly larger and for WS1.25 and WS1.5. NOTE: Drive Cap wrench required to properly "tighten" the Cap when replacing the Spacer Stack ( typically 1 to 2 turns beyond what you can do just "by hand" ). Failure to tighten properly can result in one of the o-rings to "pop out" and JAM the Piston... "locking up the valve" Performance Enhancement: Enhance the longevity and efficiency of your water softener system with our Spacer Stack V3005. Durability is at the core of our Spacer Stack V3005 control valve parts kit. Crafted to endure the demands of regular use, these components are designed to resist wear and tear. Convenient Maintenance: The V3005 valve makes it easier to replace worn-out components and address any leaks, reducing downtime and ensuring your system continues to operate effectively. Reliable Customer Service & Guarantee: Each V3005 control valve parts kit undergoes a stringent quality inspection before leaving the factory. If you encounter any issues during your purchase, our dedicated customer service team is ready to provide prompt and sincere support, ensuring a worry-free shopping experience. V3005