I have the weapon R can from PG and it works great. I took a different route to the coolant return method. On the bottom of the can there is already a drain plug, unscrew it and fit it with a $0.97 barbed fitting from Lowe's and call it a day. The reasoning I went this method is this retains the stock gravity feed design. If you are running a tube down the inside of the can you are vacuum feeding, however if you were to ever have a radiator cap failure and lose your vacuum in the radiator you would not pull that coolant back into the radiator and eventually run dry (provided there is a leak) even though you would still have coolant in the can. With it gravity feeding it always tops off the radiator and if there was a failure with the cap and a leak I would know because the site glass would tell me it is empty. Good reason to watch your site glass.