Water Knot. The water knot is a simple knot used to tie two ends of webbing together. Commonly, climbers use water knots to tie a single piece of webbing into a small loop for use as a sling. These slings are often used to ascend ropes or to capture the progress of a load when tied into a friction hitch. #reelsfb #reelsinstagram #climbing #tyingtheknot #knot #tutorial | Nots