Hat type needles are designed to be connected directly to a flat bottom valve port. Use the Needle Bushing part number 35056 to connect the needle directly to any 1/4-28 Hamilton valve.
Needle Gauge IndexThe diameter of a needle is defined by its gauge. This index displays the internal and outer dimensions as well as the dead volume.
Needle Length GuideNeedle length is a critical consideration. Each needle hub design requires a slightly different length definition. This guide illustrates how to make the different measurements.
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