Im in the middle of this same project replacing the 2 hose rear valve and figured to do the 6 hose valve also. 3 days in the garage so far.
BUT>>>> I've seen a thread somewhere where someone replaced the 2 hose rear valve with a household plumbing shut off valve.
I want to do this for 2 reasons.... freaking plastic parts break and when I look inside the nipple on the valve, its restricted down to a 1/4 inch hole!!!!! Seems to me it is so restrictive, it could be why my rear heat is never as hot as my front heat.
Im searching for that thread but if anyone has a link to it.......
Also decided to replace my water pump while its all torn apart. Last fall I replaced...... steering pump, AC compressor, 145 amp alternator, a couple pulleys. Next time I need to tear out everything under the hood for a repair.... I'm shooting myself instead!