Unused Aluminum Hydraulic Antifreeze Water Manual Flow Control Valve High Pressu
They're probably aviation related judging by the construction, maybe a ground hydraulic unit according to my imagination, LOL! Good sized manual hydraulic flow control valve. Full open is the stem traveling about 5/16 of an inch from closed, the plug on the end of the stem is about 1-1/4 in diameter. There is a locking wheel on the stem to insure the stem stays put once it's been adjusted. Ports are identical and have parallel threads (not tapered) so it will take the type hydraulic fittings that screw in by hand and then have an o-ring, washer, and locking nut.
I'm estimating the ports support 1-1/4 fittings and hose, see caliper photo of the inside diameter of the ports. I have two of these, they are identical. This listing is for 1 each.