Pump Vault Extensions open the way for deeper basins, larger reservoirs and greater water volumes. Flat panels and multiple cut lines for various sizes of pipe allow almost limitless plumbing options to easily accommodate any project from mighty waterfalls to rainwater cisterns and down flow bogs. With a 17” opening and 2” & 3” discharge cut lines, the PV23EXT pairs perfectly with the PV2300 Pump Vault comes complete with a lifetime warranty.