Compatible with Pentair Challenger Housing Round O-ring 355329

Pentair Challenger Front Housing O-ring 355329

#14 in diagram

Oring will arrive doubled over as shown in photo, this is for the round oring not the square cut

** Please note, this is for the round housing oring only not the square, please be sure your ordering for the Hi Pressure Challenger, check your system if not sure prior to ordering**