Water intake hose size

mklearl

Petty Officer 1st Class
Joined
Apr 21, 2013
Messages
379
Can someone please confirm the hose size for me for the raw water intake going from the transom up to the oil cooler? I'm measuring the inside diameter and it's one inch. Someone is telling me that it has to be either 3/4" or 1-1/4" hose. 1998 vp 5.0gipbycce.
I'm trying to buy (or make) a freshwater flush system.
Thanks in advance.
 
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