adjusts from 4

NPT Thread Size: 1/2in NPT Inlet

a spring loaded steel ball that lines up with the socket retainer hole

Vibration (fwd): 6

Desc: Large Square

MTP Wonder Pump w/ Ballast Pkg - 30A-PLUS Tire Changing_Machine adjusts from 4The Wonder Pump Model 30A Plus, formerly Model 18A, was introduced to the American agricultural market over 18 years ago; many of the pumps sold then are still in service. Thousands of 30A's have followed since this introduction. If you believe all pumps are the same, you haven't tried a "Wonder Pump" Put a Wonder Pump to work for you; compare, you will see the difference from the first tire filled. You want this pump because it pumps more using less