Perlick Lo-Boy Stainless Steel "S" Series Keg Coupler - 40030SSLSPerlick Lo Boy Stainless Steel "S" Series Keg Coupler Key Features Compatibility: Designed for single valve imported, "S" system kegs. Low Profile Design: Ideal for tapping kegs in limited space areas. Easy to Use: Simple push down and twist mechanism for tapping. The Perlick Lo Boy Stainless Steel "S" Series Keg Coupler is a must have for those who regularly deal with imported single valve "S" system kegs. Its standout feature is the low profile