|Names||Water knot, Tape knot, Ring bend, Grass knot, Overhand follow through|
|Related||Overhand knot, Beer knot, Overhand bend|
|Typical use||To join webbing for climbing|
|Caveat||Ends should be left long, knot should be tightened and inspected before each use. Difficult to untie.|
Tying the water knot
It is tied by forming an overhand knot in one end and then following it with the other end, feeding in the opposite direction.
The ends should be left at least 3 inches (7.6 cm) long and the knot should be "set" by tightening it with full body weight. The ends can be taped or lightly sewn to the standing parts to help prevent them from creeping back into the knot.
Testing has shown the water knot to slip very slightly, but very consistently, with each load and unload cycle. In tests using 9/16 in (14.3 mm) tubular webbing, repeated loading and unloading with 250 lbs (113 kg) caused one of the 3 in (76 mm) tails to work back into the knot in just over 800 loading cycles. When the water knot was statically loaded with 200 lbs (91 kg) no slipping was observed. These results validate the need to leave long tails and inspect water knots before each use. With single overhand knot safeties on either end, the combination eventually seized and the slipping stopped.
Although used in climbing, the water knot is considered unsafe. According to Walter Siebert, several deaths have been reported due to failure of this knot. In Germany the knot is also named knot of death. 
- Craig Luebben, Knots for Climbers (Evergreen, Colorado: Chockstone Press, 1993), 19.
- Tom Moyer, Water Knot Testing, 1999 International Technical Rescue Symposium, 1999. ( accessed 2007-04-07.)
- Walter Siebert (2007), Deutscher Alpenverein, Österreichischer Alpenverein, Schweizer Alpen-Club, ed., [PDF "Warten wir noch ein paar Tote ab"] (in German), bergundsteigen (Innsbruck) (2/2007): pp. 38-45, PDF. Retrieved 5. März 2008