To remove a Delta faucet, you need a screwdriver, Allen wrench, medium-size pliers and a small pipe wrench. A Delta faucet is designed with an outer handle, a cartridge assembly and an inner sleeve to ease its removal.
First, shut off the valves running to the faucet or close the main water valve. Remove the handle screw with a wrench or a headed screwdriver. In a round-handled Delta faucet, the handle screw is usually underneath a small plastic tab, while in a level-handled Delta faucet, it is found along the base of the lever. Slide off the round chrome trim and the handle, and since they are not screwed, pull them off and back from the faucet head.
Using the pliers, loosen the nuts that hold on the cartridge and unscrew it completely. Insert the screwdriver's head into the slots on top of the washing machine system and tap it lightly with a hammer to make it loose.
Remove the part by grabbing the end of the cartridge and pull it off from the inside of the faucet. Check if there are any screw trims from the trim piece before removing it from the wall. If there is difficulty following the above faucet removal tips, contact a Delta faucet professional for assistance.