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The part is a dedicated fixture that secures pool or spa cleaning poles when not in use
Use it during routine maintenance to keep circulation
Replace only the worn parts and verify proper seating before restarting circulation
It is frequently added to improve flow in high-demand systems
Pentair CNC Plus 420 Replacement Filter Cartridge | R173576 Natural Chemistry The part is a dedicatedWhat This Part Is Used For Pentair R173576 Cartridge Replacement CNC Plus 420 is a replacement filter cartridge for Clean and Clear Plus 420 systems. It filters circulating pool water to remove debris and suspended particles. Why This Part Matters Over time, cartridges lose efficiency and restrict system flow. Installing a new cartridge restores proper filtration and consistent turnover rates. Clean filtration supports balanced water chemistry and