"The AWP40B-V 4 1/2 x 10 Inch Home Filter Housing by Viqua is a high-flow filter housing for 4 1/2 x 10-inch nominal cartridges. This item features a pressure relief valve and is certified with the NSF 42 standard which represents its ability to reduce aesthetic impurities such as chlorine taste/odor. The AWP40B-V 4 1/2 x 10 Inch Home Filter Housing by Viqua is an important component of your water filtration process. A mounting bracket and filter wrench come included with the AWP40B-V system. Invest in clean water today!"