I have to resurrect this thread as I’m too new of a member to PM “rustednuts” concerning a complete rebuild kit for the hydrovac on my ‘48 2-ton truck. I have the unit apart, cleaned and inspected. Napa has suspended rebuilding them as well as supplying kits. Rock Auto has theirs permanently back ordered. Emails to others have gone unanswered.
The tag on mine is 374550. Searching eBay I found that number could be superseded to 374515. Neither kit available so far. I will be ready to purchase 4/1/21 but trying to locate a full rebuild kit now.
