These adapters are for a unique application. In the case that you have a radiator that is set up for one of our WP361 or WP362 pumps with the plate already welded to it and you want to convert back to a standard slip hose or AN arrangement, this plate can help you get there with a clean billet solution. They are supplied with the o-ring and hardware. This plate accepts any of our WN Style fittings.