very simple, instead of having the standard gasket under the stock bov, u replace it with a coke cak gasket. u may ask what a coke can gasket is? this is a gasket that doesnt have a hole in it but is still the same as standard thus sealing the hole into the cooler pipe that normally would be there (u use a coke can to make the gasket), and then with the vaccum line, all u do is tape up the nipple under the hose and put the hose back on.
with this done there is no vaccum and no pressure on the bov spring thus eliminating the stock bov from operating and just being a dummy bov.