The correct name for that hose connection is Water BY-Pass Pipe. The socket size is 32mm (six flats), I made the mistake in ordering just one part number from Toyota without realising there are 3 parts to order. I refitted my head and waited for the remaining parts to arrive, I had a problem gaining access to tighten the nut up due to the bulkhead in the way. I resolved the problem by grinding down the 32mm socket but even then it was a tight squeeze.
Part numbers 90401-22004 Bolt Union 1 off,
90405-17005 Water By-Pass Pipe 1 off,
90430-22008 Gaskets 2 off,
These are old part numbers but Toyota should be able to identify them.
Hope this helps Bill UK
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