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Comparison : Item # MS-2M-40-B, MS Series 1/8 Inch (in) Male NPT Thread Size Speed Control Muffler
Item # MS-4M-40-B, MS Series 1/4 Inch (in) Male NPT Thread Size Speed Control Muffler
Item # MS-6M-40-B, MS Series 3/8 Inch (in) Male NPT Thread Size Speed Control Muffler
Item # MS-8M-40-B, MS Series 1/2 Inch (in) Male NPT Thread Size Speed Control Muffler
Item # MS-12M-40-B, MS Series 3/4 Inch (in) Male NPT Thread Size Speed Control Muffler