1/8 NPT nickel-plated steel cap, very useful when you want to provide a hole on the exhaust manifold and temporarily you do not want to immediately buy the instrument with its yellow probe, so you can re-unscrew it later so that you must already find the manifold without having to reassemble the entire turbo manifold assembly. double protoxide
Stainless steel threaded bush to be welded onto the exhaust manifold for insertion of thermocouple nipple for reading the exhaust gas temperature with EGT.