This Viking Heavy Duty Wrench (part number 22978MB) is an extra-sturdy tool used to install and remove VK4621 and VK4921 Mirage Concealed Sprinklers.
You must use either the Heavy Duty Wrench or the Viking Installation Wrench (23143) on Viking latest VK4621 and VK4921 sprinklers. While other Viking wrenches may seem to fit the sprinkler adapter cup, they could permanently damage the sprinkler assembly. Wrench requires a 1/2-in. socket driver, not included.
To use this Viking Wrench, insert the wrench into the slots on the protective cap. Rotate slightly left or right ensuring the lines of the wrench properly align with the vent openings on the adapter cup and lock into place. Be careful! A leak-tight seal is required. Turn the sprinkler clockwise 1 to 1-1/2 turns past finger tight. See image in image carousel above for visual instructions or use your phones camera to open the QR code on the product image.