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Yes the special plug is required to make double acting use of the side (pipe plug) ports. That's because one of the rear ports delivers oil to the rock shaft cylinder when it is fitted with what you call the dummy plug. The other port dumps oil back into the reservoir and as such does not deliver any pressure out the pipe plug port. The dummy plugs are both open forward into the tractor, one to the rockshaft, the other to the reservoir. If memory serves me right, the lower port will work the remote but ONLY after the rockshaft has reached the end of its stroke. The upper port needs to be equipped with the valve type of plug mentioned in the parts listing. Might be backwards on that. I have had bad luck using the arrangement you're trying to build. I have one of the special plugs and when used for double acting remote service, the rockshaft is still in service. Unfortunately shock loads on the remote cylinder (plow tire dropping into a rut or furrow for example) cause abnormally high pressures in the rochshaft cylinder. These abnormal pressures caused repeated failure of either the gasket between the rockshaft cylinder and the basic housing or the rockshaft piston cup. Had this same luck with more than one tractor! My solution was to install regular remote cylinder hose end plugs in the ports. Then using ST ells and short pieces of hose plumbed them to the quick attach couplings. I mounted the couplings in a break away bracket mounted where the original coupling storage bracket was bolted to the left side of the power-trol valve housing. Now when my old break away plow unitches, I don't loose oil, don't break hoses and I've not had a blown rockshaft piston cup or rockshaft gasket in over 20 years! Later.
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