concoa 412-23-31-000 pressure control regulator --

http://techair.com/concoaregspdfs/412.pdf -- this website will give you more info about the model numbers -- the last two numbers on the label look like 13 or 1b I cant make it out but looking at the website we feel this is the "000" inlet and that is a 1/4" fpt-- the unit show light shelf wear from being stored open-- no instructions-- no original box.

ask other questions you have!! shoes are sold on consignment so i have to go by the sellers asking price. i do understand shipping costs are high now and i do go by the post office prices. for heavy items please send your zip code and i can check for a cheaper rate through fedex. i ship mon-fri.