KleenWater 50 Micron String Wound Water Filter Cartridge 4.5x20 Inch | Compatible with Watts SF5-20-425 & Pentek WP5BB20P | Made in USA | For Home, RV & Commercial Water Filtration Systems

This high quality kit includes (3) KleenWater KW4520SW string wound water filter cartridges and (1) o-ring compatible with Pentair and Pentek "Big Blue" water filters. The cartridges are made in the USA of polypropylene and will trap sediment down to 50 microns. The cartridge should be changed every 6 months or upon substantial pressure reduction. The KW4520SW is a compatible replacement to Watts SF50-20-425, Pentek WP50BB20P, Shelco MS20FP5045, Shelco MS20PP5045 and Liquidtec SWF-45-2050. The o-ring will accommodate filter housings which require large diameter cartridges. These cartridges have an approximate diameter of 4.5 inches. The o-ring itself actually measures approximately 5.465 inches (inside diameter). We recommend consumers keep a spare o ring on hand to avoid urgent situations. This o-ring is compatible with Part # 151122. An o-ring facilitates a water tight seal between the water filter sump and the water filter head. The most common o-rings used in water filtration are made from Buna N material. Buna N is also commonly referred to as nitrile. This is the ideal choice for cold water filtration because they are inexpensive and have superior performance characteristics. The o-ring and cartridge are rated for a maximum temperature of 180 degrees.