Blau, my point about this process not being rocket science is simply to try to quell the nay-sayers of this job being a DIY project. It is really simple. If you may have missed the purpose of the o-rings, please let me reiterate, The threaded ends of the hose have an 0-ring in there. The o-ring seals the connection. The only reason for the threaded connections is to simply hold the hoses together, the threaded connections themselves seal absolutely nothing. There is no sealant. The o-ring does the sealing. DO NOT overly tighten the connections, as again, they do not do the job of sealing. At the drier/receiver connection you will find it is simply a compression fit as in any plumbing connection. Just snug the connection because it is soft brass. Again, DO NOT overly tighten the joint. If you have any further questions please feel free to e-mail.