Aladdin O-Ring, 5-1/4″ ID, O-411-9

This is the Aladdin O-411-9 o-ring, 5-1/4 in. inside diameter with a 3/16 in. thickness. It also carries the substitute part number 47-0355-48.

Buying by size

O-rings are identified by dimension rather than by the machine they came out of. The two numbers that matter are the inside diameter, measured across the hole, and the thickness of the cord. Match both against the ring you are removing and the seal will sit where it should.

Application

This size is listed with the Jacuzzi Sand Trap top mount sand filter parts for the RMST-24 and ST-24 models. Fit it clean and dry, or with a lubricant intended for pool o-rings, and never stretch it into place.