The primary difference between a Moen 1222 and a Moen 1225 cartridge lies in their valve application and internal safety engineering. The 1222 cartridge is a Posi-Temp model engineered exclusively for single-handle pressure-balancing shower valves that prevent sudden temperature spikes. The 1225 cartridge is a standard one-handle model designed for conventional mixing valves used in kitchen sinks, lavatories, and older tub/shower combinations. Their physical dimensions, stem configurations, and port alignments are completely distinct and cannot be interchanged.
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