Draught Beer Basics

ALL ABOUT COUPLERS
A keg coupler connects the Carbon Dioxide gas line (CO2) to the
keg. The compressed gas powers the coupler to draw out the beer
from the keg. Dierent countries use dierence keg couplers, so it
is important to have the right coupler for the specific brand you are
going to be dispensing. Perlick residential beer dispensers come
standard with a Low Profile “D” Keg Coupler that can be used on
any barrel size of American “D” system sankey kegs*.
Please note that if you are using a coupler other than the one
provided by Perlick, it must be used with a short 1/4 barrel. A
traditional sized coupler will not fit in the cabinet with a standard
23 3/8” tall keg.
Coupler Size D* U G A
Perlick Part No. 40030 63908 63907 63909
“S” System
Keg Coupler
“M” System
Keg Coupler
In some instances, an “S” or “M”
size coupler will be required. An “S”
System keg coupler is much like the
“D”, but with a stem that extends
roughly a 1/4” further into the keg. The
“M” System coupler is relatively new to
the US market, and is only used by a
select number of breweries.