A bunch of pneumatic fittings in a portable organizing case. Some parts are new and unused, and other used but in great working shape. $28 price is for the entire case.

-Many of the parts are brass quick-disconnect industrial couplings, 1/8" , 1/4", or 1/2"-pipe-thread size. There are about ten complete sets of male and female (these are the parts in the second photo, when removed from the compartments)
-There are also about 20-30 push-to-connect tubing connectors (mainly high quality Nihon Pisco brand) terminated in 1/8" pipe thread, with forms like elbows, Ts, and so on, in sizes of 1/4", 5/16", and 3/8" tubing diameter (this is the largest compartment in the photo)
-About ten various thread-to-barb adapters, in 1/8", 1/4", and 1/2" thread sizes.
-random barbed plastic Ts, tube terminations, etc.
-two brass elbows, a pipe-size converter, and two 1/8" gender changers (one m/m, one f/f)
-two rolls of teflon tape, one full, one half-full