I bought a recovery style catch can today....my question is it legal to install like it is provided. Here's a pic:


Can I leave the top overflow hose open like that with the bottom fitting hooked to the radiator?

Just wondering if this is legal or not....Or does it have to be a sealed catch can?

Mine has a drain on the bottom but looks the same,
top hose goes to the rad.... or if you have a recovery
type system put the bottom hose on... just has to be
a quart size

At least quart size isn't it. Ys if you have a recovery radiator cap put the overflow to the bottom of the tank so that it can suck the coolant back upon cooldown. Make sure to have the catch can vented or it will do no good for you as it will not allow coolant into it. even if you are just using it as an overflow and hve the hose into the top it needs to be vented.
As for legal there is no specifics that I know of as long as it holds a minimum amount. I use a quart pet water bottle with an overflow hose into the top going to the bottom of the jug for recovery.

Thanks guy...I was thinking maybe that since the oveflow could actually overflow if the tank was full then it may not be legal..I guess I was wrong. I will hook it up as a recovery tank then (bottom fitting... )

I think that top hose does suck from the bottom of the tank.

the bottom is just a drain.

True story; My very first time racing at l.a.c.r. back in the early 90`s, I had my sports bottle filled w/some southern comfort and cherry coke and the tech said I needed an over-flow bottle so I could race. So, I finished my drink, gathered the needed items to rig it up and have been using it ever since w/3/8`s alum. tubing and a spark plug boot to attatch to the rad. So yes, those should be MORE than legal.

I have a recovery system like yours. Tech at US131 made me block off the top hose. I used a bolt and small hose clamp. I now have a petcock on the upper hose, so I can close it off while racing.