I have two MP40WES dated Aug 14, 2012 & Dec 17, 2013 that I had for a build that doesn't look to be happening. I purchased a full setup off craigslist in August and these were on the tank and running fine when I purchased it. Since purchase I've cleaned them up and they've been in a box in the basement waiting for the right tank and just doesn't appear the tank is going to come around so figured it was time to clean house a bit. One has slight separation but doesn't impact performance: Asking $190 each or $350 for the pair shipping and PayPal fees included in that price. Or would trade towards MP10WQD, Apex Leak Detection, maybe a few other Apex modules, etc.