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I can't remember the exact size for the 3/8 but it is their biggest I think. As for the 3/8 hose that is fine for 4" but you should really consider some 1/2 hose at some time it will give you a faster clean. 3/8 with lots of bends and 1/2 for cleanouts with straight shots to the street. And a 24hp honda will probably be around 2700 - 3200 psi with a jetter tip on at 12 gpm.