As for beer coupler, we have four size for your choose: A,G,S,D.
Our beer coupler with pressure valve , when prussure up 55-65 PSI that stops the gas flow.
We will replace new box one by one. 20pcs - by express, about 21kgs. 35pcs-by express about 36kgs.
package one by one boxes -20pcs/ctn, if you by sea we have pallet +Waterproof membrane + bandage, protect the goods.