Thanks for looking. I've never worked w/ Pnuematic gear B4. Just rec'd set of Jet 1a (Boomer XL) retracts. Absolutely NO documentation. None. Call in to dealer. In the meantime tho here's my question:

Seeing only one line fitting on the cylinder I'm wondering are these of the "air up, spring down" type?

Thx on behalf of newbs everywhere for these forums and the support of our fellow modelers.