Cast brass valve 62mm long
Threaded nipple end : M16 X1.5 tapered thread
(This is very close to, but not exactly, 3/8 X 18 NPT)
Wrench Size:               20 mm.
Nob is like wing nut turns 90 degrees. 1/4 turn.
Barbed Hose end has 4 barbs.  
Small peice of hose still attached has 10mm I.D.
Fits what ever year it fits.

Chris Phillips 60 Westfalia [Just got its first rust hole :(  ]
                        66 SQBK