W Cooper Hub w/Standpipe [RS-18 No Laterals] (2018A) claytonlambert Check valves are useful because

Check valves are useful because they help maintain one-way flow and reduce the risk of unwanted reverse movement through the line

Waterway round anti-vortex main drain grate

and this Darlly cartridge is designed for compatible applications using the PAS40-F2M reference

Useful for routine cover-service work

W Cooper Hub w/Standpipe [RS-18 No Laterals] (2018A) claytonlambert Check valves are useful becauseW Cooper Hub w Standpipe [RS 18 No Laterals] (2018A) is a W. Cooper Industries hub with standpipe for compatible RS 18 No Laterals filter assemblies. The hub and standpipe help direct water through the filter system and are key internal components in proper filtration performance. This replacement version is listed without laterals, making it useful when the standpipe or hub requires replacement but the matching lateral set is handled separately.