I don't think we have to worry about moisture to much here in Arizona, I haven't put a check valve on mine yet. I don't have a heavy foot so I don't worry about it that much. When you put a tune on the car to run more boost then I wood run a check valve and a second catch can. The bigger of the two hoses that come in the kit goes to the manifold nipple, your going to have too use the stock hose clamp that comes off the stock hose. It will be a tight fit on the hose from the kit. Put the clamp on the hose where you wont the clamp to be & push it on. Remember its plastic so be careful. DONT USE THOSE HOSE CLAMPS ON THE MANIFOLD, YOU JUST DONT KNOW HOW TIGHT THOSE THINGS ARE. Look at my picture & the hose clamp at the manifold, where the hose clamp is, where I clamped it when I push it on the manifold. If you need a hand, I'll be here.
I did get two longer screws to mount the catch can on the bracket, I'd rather be safe then sorry.
I found the baggy the reducer I bought & here's a picture for you. I know your thinking the sizes don't match up to the hoses, but it is a tight fit, no hose clamps have to be used. You can make the hose pliable by putting the hose on a smooth surface and hit the end of the hose with a rubber hammer about 10 to 15 time. " NO SUPER HARD BUT NICE AND CONSISTANT. That makes the rubber pliable to get over the reducer.
REMEBER, THE HOSE YOU NEED FOR THE CRANK CASE NIPPLE IS 5/16 INSIDE DIAMETER.
View attachment 2043
View attachment 2044