I did some checking around today on the Lopez Valve as I had never heard of it. I found a description of it on the internet but I was not sure if it would work for me since my new unit does not seperate at the end like my old unit did. This one is one peace for all the external section. I don't have any idea what is on the inside. While I was out doing some other things we checked at a local pharmacy. They had not heard of it so they looked it up on the web and found it where I did. The price we saw was over $300 but he thought that might be a case price although it didn't tell us on that page. No way could I afford $300! When I got home I checked some more and eventually found out that they sell in a case of 50 so that would bring it down to around $6 each. If I can find someone that sells them individually and not at too large a markup I may try one. I have some appointments on 1/10 at the VA Hospital so I will try and ask around then. I am a charity case so I depend a lot on what I can get from the VA.