Dash 4 is a hose size, not a thread.
Quote from Mechanic's Toolbox
In the automotive world, hose size is expressed by inside diameter. For example, a 3/8 inch has has a nominal (approximate) inside diameter (ID) of 3/8 inch. Not so with aircraft hose. Aircraft hose uses dash numbers to designate the hose size.
Dash size is in 1/16 of an inch. So
-2 (2/16) 1/8 inch,
-6 (6/16) 3/8 inch,
-8 (8/16) 1/2 inch and so on.
But be careful, this does not mean that a -6 hose has an inside diameter of 3/8 inch. In fact, it can be anywhere from .298 to .359 inch, depending upon the hose type.
The thread in the G3 lifter is 1/4" npt I'm sure G4 is the same.
so if you already have the hoses just take them to a good hydraulic hose company and ask them to get some stainless adaptors
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