Easy as pie. Did it in about 20 mins on my trailer. Make sure you tape the valve on top while you flip the valve. There is a short video on the aire site. He breaks his valve stem, but I unscrewed the rubber piece. Shouldn't be a problem.

 

B7 info



Here is a link to our B7 How to video:
AIRE - Leafield B7 Valve Rebuild - YouTube

And here is a link to a B7 instruction sheet:
http://www.aire.com/aire/images/manuals/B7%20Diaphragm%20Replacement.pdf

Good luck!

Peace,
Sheena Coles
AIRE marketing