Backscatter No Burp O-ring For TG Housings & M52 Wide Angle Lens
Amazon.com: REPLACEMENTKITS.COM Brand Heavy Duty Filter Housing O-Ring Fits Big Blue Housings Replaces Pentair Pentek 151122, Culligan OR-100, ACE 4001756 & AP WP-10 OR : Tools & Home Improvement
What is an O Ring - Selection, Material and Storage : Barnwell