Pentair Chlorinator Lid O-Ring 3 # R172009

Pentair Chlorinator Lid O-Ring 3 # R172009

Pentair Chlorinator Lid O-Ring 3 # R172009

Yep, it's a 3 inch o-ring. Pretty amazing stuff. It's 3 inches in diameter, made of black rubber. It fits in my chlorinator lid like a champ. I put it in there, screwed on the lid and viola! the thing is closed and sealed. My life is complete.
Pentair Chlorinator Lid O-Ring 3 # R172009