Plugs & Tunnels

(side views)

A. Gauge/Inch*
B. Wearable Area

*Size is most commonly expressed as a gauge or fractional inch. Regardless of the flare style, all of them are measured squarely in the middle (A).

Flare Styles:
1. Straight (2 o-rings)
2. Single Flare (1 o-ring)
3. Double Flare
4. Screw-on