i ordered a grease gun filler for five gallon grease bucket, when i received the filler, the coupler and the adapter for the grease gun was missing, i emailed Northern and received the response, discard the unit and a replacement will be sent. they send a complete unit, free. the first grease gun filler had a parts list with it so i sent a note to the manufacturer, they sent the two pieces i needed also free. i now had two grease gun fillers, gave one to my son. i'm happy with Northern.