I can't remember which thread I read where a couple of people asked about the sensor locks for the Pressure Pro sensors. In that thread they stated they could not find them on the Doran site. While I was doing research on the Pressure Pro I found this website that sells the locks. Enjoy
http://www.rvcams.com/merchant2/merc...ressurePro7050
EDIT: Excuse the above post. I just found the sensor locks on the Doran site as well. I thought I was going to really help. I tried anyway.