Adapter for Shark vacuum cleaner for Shop Vac accessories

This is a vacuum cleaner adapter that can be used to connect accessories from a Shop Vac vacuum cleaner to a Shark vacuum cleaner. The adapter fits into both Shark's wand and Shop Vac's accessories. There are two versions - one with letters for identification and one without. Please note: I'm not sure if all Shark vacuums have the same diameter wand, nor am I sure if the more expensive Shop Vacs have different diameters.