In My Garage
Well-known member
The user manual states that the fittings are currently NPT 3/8"
All except the fitting that screws into the hydraulic cylinder.
That fitting is a reducer from 3/8 NPT female to 1/4 NPT male.
Its the one on the far left...
Also they have Stainless steel fittings and Steel fittings. There is quite a price difference between the two. Which one to get?
Steel is all you need. Stainless is all very nice but it tends to gall if you ever wanted to take them apart.

Well done. I know you have put a lot of thought and work into this. One thing I noticed is you have a standard garage door opener. What is the height from the floor to the opener? If you need more clearance you may want to raise the tracks a bit and use a jackshaft opener like the Liftmaster 3800. In my garage I had to do that as my ceiling is only 9'.