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Comparison : Item # MJ-2M-PP, MJ Series 1/8 Inch (in) Male NPT Thread Size Standard Design Serviceable Muffler
Item # MJ-4M-PP, MJ Series 1/4 Inch (in) Male NPT Thread Size Standard Design Serviceable Muffler
Item # MJ-6M-PP, MJ Series 3/8 Inch (in) Male NPT Thread Size Standard Design Serviceable Muffler
Item # MJ-8M-PP, MJ Series 1/2 Inch (in) Male NPT Thread Size Standard Design Serviceable Muffler
Item # MJ-12M-PP, MJ Series 3/4 Inch (in) Male NPT Thread Size Standard Design Serviceable Muffler