Made In USA. Melling expansion / freeze plug kits provide an efficient way to supply the plug requirements to complete your engine rebuild. Melling offers convenient bagged coverage for most domestic and import engine applications. Each kit contains the high quality expansion/freeze plugs needed for the listed application plus the pipe plugs required to complete the job. Melling expansion/freeze plug kits are available with either steel or brass water jacket plugs depending on engine usage and customer preference. Don’t waste your time looking for the correct expansion/freeze plugs and pipe plugs. When you are ready to put your engine together, select an expansion / freeze plug kit from Melling.