The most common Moen cartridge is the legendary Moen 1225 (the standard One-Handle cartridge) closely followed by the Moen 1222 (the Posi-Temp pressure-balancing shower cartridge). The 1225 has been a staple in single-handle kitchen, lavatory, and tub/shower valves for decades, utilized across millions of residential homes due to its reliable, versatile design. Similarly, the 1222 Posi-Temp cartridge is ubiquitous in modern shower installations, prized for its ability to maintain consistent water temperature even when other household fixtures draw water, making both parts standard inventory in every plumbing supply truck.
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