Safely swing to connect With full flow, no force required or loss of pressure in the system. Just a turn and the air vent ensures that the hose is ventilated – thus rendering it harmless. TST fittings are more efficient with low energy consumption. TST Swing Couplings SC are available in nominal sizes DN6 to DN19 and in different models. As a result, they are compatible with most popular plug systems. TST Couplings are suitable for numerous applications throughout industry. Durability, reliability, simple and safe handling are features of all TST Swing Couplings. Above all, TST Swing Couplings fulfil all the requirements of current quality standards.