IRWIN 1904ZR 3/8-18 NPT TAPER CARBON STEEL PIPE HAND TAP RH 4 FLUTE. MOST HAND TOOLS ARE FULLY COVERED BY MANUFACTURER UNLESS OTHERWISE STATED. POWER TOOLS ARE ALSO COVERED BY MANUFACTURER'S WARRANTY AND ARE USUALLY HONORED AT A SERVICE CENTER IN YOUR AREA.
This is perfect for a water temp sensor adapter with a 3/8-18 hole. Most aftermarket thermostat housings for a small block Ford that have a provision at the top for a sensor, are usually tapped not deep enough for the sender or adapter to seat very well. With this tap I was able to get the adapter to sit down lower in the housing thus moving the sender tip lower into the coolant.