Brita Faucet Filtration System Brand_Masterbuilt helix is 31 degree which

helix is 31 degree which minimizes the over aggressiveness of a true parabolic flute

Drop-forged

standard cartridge filter & retainer

Knurled adjusting screw turns easily by hand or with a hex key inserted into the hex key receiver on bottom of screw

excellent stain blocking resistance

Brita Faucet Filtration System Brand_Masterbuilt helix is 31 degree whichBrita Faucet Filtration System, Great Value & Convenience, Attaches Easily In Minutes, No Tools Required, Fits All Standard Faucets, Quick & Easy Filter Replacement, Electronic Filter Life Indicator Tells You When To Replace Filter, For Replacement Filter Use True Value #238 292.