Glad people are still using the mac valve replacement. I found this on an old land cruiser digest post so I am not the original inventor. Here it is again if anyone is having trouble finding it. The valves are industrial quality and should last forever.
Fix for Vaccum Selonoid Transfer Switch
By Keil Thompson
Here is the solution if your vaccum selonoid fails:
Parts:
mac 35a-aaa-ddba-1ba valve 12v 2 each total $ 34.00
arrow asp-1 exh muffler 2 each total 3.20
28-4-2 parker fitting-qty 4 each total 0.44
Grand Total for two complete valve assemblies $39.64
Installation:
The mac valves have three slots for the fittings.
I used teflon tape to get a good seal.
The exhaust fitting goes in the top numbered 3.
Install the parker fittings in the other two screw intakes>
The line from the manifold goes into the fitting that is marked 1
on the mac valve.
The line from the transfer goes into fitting marked 2.
Cut the old wire leads off and connect the mac valve leads
connect the vaccum lines.
I formed a mounting bracket out of aluminum.
To find mac valve dealer go to
www.macvalves.com
I got mine here in ga. from tsi solutions 770-879-3500 but i think
that they only sell in georgia