Kofofin kabad ɗin da aka sanyaya a cikin firiji galibi ana yin su ne da gilashi biyu da aka saka a kan firam ɗin jikin ƙofar, kuma ana ƙara abubuwan da ke lalata iska tsakanin gilashin mai layi biyu don yin hatimi biyu don yin gilashin da ke rufewa, kuma ana iya cika shi da nitrogen tare da ƙarancin ƙarfin zafi ko helium. An haɗa ƙofar da kabad ɗin ta hanyar hinges.

Kayan aikin da ake buƙata don sarrafa ƙofofin gilashi biyu masu firiji:

Cikakken iskar gas ta atomatik akan layi layin samar da gilashi mai rufi, injin rufe butyl, injin rufewa, injin lanƙwasa aluminum, injin cikawa mai bushewa, injin canja wurin sarari na aluminum.