TPD1317e Chapter 3 1/2” bore siphon break To overboard outlet 450mm (18”) Water injection elbow Exhaust riser Top of exhaust riser and point at which the siphon break is connected to the engine pipe work must be above the water line under the worst possible conditions (normally a distance Exhaust tank (water lock) of 450mm (18”) under static conditions will be sufficient) Figure 10 - Water lift system a. Minimum volume of exhaust tank should be 3 times the volume of the water in the riser. b. The tank should be installed near the centre-line of sailing craft. Page 21