Power Tanks Monster Valve Tap 1/4 NPT 
Monster Tap 1/4 NPT Bright Steel from Power Tank. This is a high-quality bright steel 1/4 Inch NPT tap for tapping the mounting hole for your Monster Valves. This is a tap that you’ll probably use for a lifetime. Cuts through steel and aluminum. The hole size to drill for this tap is 7/16 Inch.
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