ROUND EXTENSION COLLAR | SPX1084P Pentair Heat/Cool Pumps 5" diameter with 6 threads

5" diameter with 6 threads per inch (TPI)

This prevents water from entering the light fixture

Do not overtighten mounting hardware—a snug fit reduces vibration without warping support

it means the mechanism has failed and is stuck in the open position

ROUND EXTENSION COLLAR | SPX1084P Pentair Heat/Cool Pumps 5" diameter with 6 threadsROUND EXTENSION COLLAR SPX1084P The Hayward SPX1084P Round Extension Collar is an adapter piece that fits onto a Hayward skimmer's throat (the opening where water enters). It plays a role in making sure the skimmer functions properly when pool construction or modifications require additional depth. Extends the Skimmer Throat If a pool has thicker walls (such as when adding new tile, plaster, or vinyl liner), the extension collar increases the skimmers