The Pentek 153097 is the correct filter housing sump for the following filter housings:
The Pentek 153097 20" Big Blue Filter Housing Sump is a replacement filter housing sump for Pentek PBH-40 Bag Filter Housings, as well as PBH-420-1 and PBH-420-1.5 housings from Pentek, Ametek, and U.S. Filter. This Big Blue filter housing sump includes a 3/8" NPT drain hole but does not come with the 144357 valve at the bottom of the sump. This #20 big blue sump is also known by part number 153097 and is made from high quality, durable material that is meant to be long-lasting.
Pentek 153097 20" Big Blue Filter Housing Sump specifications: