Genuine Binzel MB15 Contact Tip Holder / Diffuser - 002.0078
If you have an MB15 MIG torch this is the brass part which screws into the neck of the torch. It has a double purpose - the first is that it diffuses the gas to the shroud giving an even gas shield and the second purpose is to hold the contact tip in place.
This is a slightly longer lived consumable / maintenance part. Supplied without a spring if you are buying this item please consider adding a spare spring. Alternatively if you buy a replacement neck complete the spring and tip holder come ready fitted.