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How to Identify the size of an Enderle Shut off Valve
Illustration of  3 Way Shut off valves for Identification:

Measure the outside of the Round Cast Area where the arm pivots:

1.00”   is a -6  Shut off valve * the threads are also -6

1.3”   is a -8 Shut off Valve  * The threads are also -8

1.45”  is a -12  Shut off Valve  * The threads are -12

It is essential that if you have a blown Alcohol engine or an injected nitro engine that you use a -8 minimum valve - Never a -6