There are O-rings on both sides of my weldless fittings, is this correct?

We include an extra set of O-rings on the exterior of virtually all weldless fittings included on our Brewmaster Chronical line.

In fact, these are spares, and only one O-ring is required for a water tight seal on each connection.  

Furthermore, the o-ring is designed to mate with the interior of the Chronical wall.  Remove all o-rings from the exterior weldless fittings and retain them for safe keeping.