Whole House Sediment Water Filter, Installs Easily On 3/4 inch Main Water Line, Clear Sump, Wrench Included, Patented Shut Off Value in Cap Makes Changing Cartridges Easy, Uses 3/4 inchComp, x 3/4 inch MIP Fitting True Value # 467-621, Several Replacement Cartridges To Choose From Model #P5 True Value #529-286, Model #CW-F True Value #583-393, Model #CW-MF True Value #583-401 Or Model # S1-AD True Value #614-800, Cartridges Sold Separately.