Comparison : Item # M1-540-8FM, Single Stage Flowmeter Regulator with CGA-540 Nut and Nipple Inlet
Item # M1-540-8FMH, Single Stage Flowmeter Regulator with CGA-540 Handtight Nut and Nipple Inlet
Item # M1-870-8FM, Single Stage Flowmeter Regulator with CGA-870 Yoke Inlet
Item # M1-540-15FM, Single Stage Flowmeter Regulator with CGA-540 Nut and Nipple Inlet
Item # M1-540-15FMH, Single Stage Flowmeter Regulator with CGA-540 Handtight Nut and Nipple Inlet