One comes off the raw water intake (by the thermostat housing/temp sender/the small cast lump of metal with 4-5 hoses leading to it). The other comes off the engine circulatory pump - You'll find it by locating the pump (in the middle as you look at the engine - on the back if you have a V drive, on the front if you have an I/O or direct drive). The tube will be 5/8ths heater hose (as Timmy! said) and will be labelled as such so you'll know you are removing the right ones. Take a look at the heater - if water is spewing from it, then its likely corroded and needs replacing. heatercraft.com will be the most likely place to find your replacement. Hope that helps!
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