your heater hose is 5/8"
I used a 3/4" ball valve with two 3/4" NPT to 5/8" barb, the aforementioned fitting who will most likely find in the area of the hardware store were they have garden hose repair kits, most garden hoses are 5/8"
As for what line, I put the valve in the line coming out of the head, I think that is were the coolant flows to the heater core. I saw a medium duty IHC with a T444 that had the heater core shut off valve screwed right into the head.
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Jay 413-222-8286 I got hay for sale
'97 F350 CC, DRW, pickup, 7.3, E4OD, 2wd, 4.10, 405K
'00 F550 reg cab, 11' flatbed, 4x4, 7.3, 6637, 4R100 (soon to be a ZF6), 290k
'97 GMC 5500, getting a transplant, 3.36, sleeper, 350k
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