Waterway Jet Small O-ring for Mini Jet Internal 805-0016. This o-ring is 1/16" cross section thickness and has a 5/8" inner diamter. This comes in a 10 pack. Waterway Jet Small O-ring, mini jet internal 2 req'd. 2-3/8" face diameter. Standard nozzle size 5/16" (10 GPM). Used with Adjustable Mini Jet, AF Mark II, Cleaner, Sweep I Model L79BL, Sweep II Model L79BL. Mini Jet O-Ring AS568 number 16 by HydroAir/Balboa, Letro/Pentair, Polaris/Zodiac, Waterway.