N/A Huma Regulator Body O-ring

[oOmpH]

Anybody knows the specs of the body o-ring on a Huma regulator for Daystate Huntsman, Weihrauch HW100, AEA HP SS, Artemis PP700 or Brocock Compatto?

Asked Huma directly but only Huub, who's on holiday until September knows. Rest of team says buy a kit

 

[Motorhead]

Whats the tubes I.D. ( Metric or SAE ) ?

How deep is the groove on regs O.D. ?

Having that will be EASY to figure what size o-ring is being used.