This 20” filter housing is NSF listed and doubles the flow rate of the 10” housings (10 to 12 gpm). Housings are rated at 25 psi at 125°F, have EPDM and silicone O-rings with 0.75” FNPT inlet and outlet, polypropylene plastic, weigh 3 lbs. Fit pleated filters, polypropylene filter cartridges and other standard 20” filters. Cartridges are 20" long x 2.5" diameter.  Housing is 23.25" long x 5.5" diameter.