Those fittings are called ORFS ( O-Ring Face Seal) ,Ronald at Ranchhand supply has some fittings to replace these with and can also make you hoses.Give him a try 757-650-9124
It looks like the O-ring is missing. It should go inside that groove in the male piece. I'd go to Harbor Freight and get a box of metric O-rings and see if one fits.
I am not an expert, but it looks to me that that is the type of fitting that takes the 'rubber-wrapped washer'. Can't remember what it is actually called.