Water hose connection with O ring. I ordered this exact part for and it doesn’t lock in place. So when you turn the water on the pressure just shoots it off. Is there a smaller on something different i am missing.

Hey there, if you are connecting it to a hose and it's popping off, try pushing it farther in enough for it to lock. If you end up still having trouble, please give us a call and our specialists can help you out!

Hi! I am curious to know if the inlet and outlet fixings are compatible between the original Hydropower DI tanks and these newer Hydropower Ultra tanks. I believe those are A, H or D in the diagram. Thanks.

Yes all the fittings are the same sizes.