The TW coupling is a simple and reliable way to couple two elements to each other. The female connecting piece with lock, ring and handle fits the male connecting piece. Two claws ensure a solid and leakproof connection with the turning of the locking ring. Folding the handle in after tightening ensures the locking of the coupling. The European Committee for Standardization (CEN) decided in 1973 that the “three-lug TW coupling (DN 100)” applies as the standard for connections for tankers and railway carriages. 28450, MS 2464.3 pressure range 16 bar.