HAND TAP CS - 1/4 INCH X 18 - NPT - ALPS
https://www.toolsnsafety.com/shop/hand-tap-cs-1-4-inch-x-18-npt-alps-4245
https://www.toolsnsafety.com/web/image/product.template/4245/image_1920?unique=c7c0967
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Carbon Steel Cut Thread Hand Taps NPT