Repacing the seals in my breakaway coupler (on a JD 1030). In the body of the coupler, there are seals for the receptacle. Each one used to be a two piece seal, now a one piece seal (part number R79311). It is a "U" shaped seal (cross secion on edge). The more prominent "lip" is on the split side, i.e., larger diameter than on the solid side. Which one goes towards the pressure? I am fairly sure it should the prominent lip side to pressure, but want to make sure (and JD is closed today until Monday so cannot ask them).