I don't know if it is, but I wouldn't be surprised! The LFS thought it was odd that the shaft didn't break earlier with all the messing around with the pump. I decided, since I was replacing the pump, to do the gate valve mod. I just purchased all the pvc, but now I am waiting for the gate valve to show up from NY. I am building it just like the Octopus photos. I am thinking about doing a thread on how to do it for much cheaper then Octopus wanted for their kit, but there are so many threads out there I dont know if it is worth it.