PART NO. SPL.PAGE DESCRIPTION
3H576 15.A.7 Tap -water drain -(engine unit, 1500)
3H576 sup.8 Tap -cylinder drain -(engine unit, sup)
3H576 16.A.2 Tap -cylinder block drain -(engine unit, 1600)
3H576 TC.A.1 Tap -water drain -(cyl.block assy, engine, Twin Cam)
ARH1050 15.C.1 Tap -drain -for radiator block -(cooling system, 1500)
ARH1050 16.C.1 Tap -drain -(for radiator core assy, cooling system, 1600)
ARH1050 TC.C.1 Tap -drain -(cooling system, Twin Cam)
The thread is 1/4-inch BSPP (British Standard Pipe Parallel thread). The standard thread designation is G-1/4. This is a Whitworth form parallel fastening thread, 19 threads per inch, and major diameter is 0.518-in (13.157-mm).
For more information on Petcock Drain Valves see COOL-128
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