Hydrologic Big Boy 20" Filter HousingThis heavy duty filter housing is built for housing Hydrologic Big Boy water filters. It has a unique design that makes cleaning and replacement quick. This NSF certified housing consists of inlet and outlet ports for the speedy flow of water. Since there is no pressure release button, it prevents water leakage and extends the lifespan of the filter housing. Made using polypropylene, the filter housing can withstand chemicals, variation in water