Do I need one?
IIRC you could cap the heat stove on the Offy and run a water inlet to the manifolds PCV port (or whatever that little screw is on the side) , but you'd have to plumb a return off the bottom of the stove cap, easy enough to redirect it as the new extended bypass from head to pump.
IIRC you could cap the heat stove on the Offy and run a water inlet to the manifolds PCV port (or whatever that little screw is on the side) , but you'd have to plumb a return off the bottom of the stove cap, easy enough to redirect it as the new extended bypass from head to pump.
