Those Gizmos seem like the only thing from stopping your pipes from freezing is the gizmo and the O-ring. I have removed gizmos in the past and found the o-rings were cracked. I had a pool service close the pool one gizmo had teflon tape and the other gizmo used an O-ring. I was not sure how they should be installed, I guess both ways would work as long as they do not leak. So anyhow, I switched over to a 2 liter bottle with sand, antifreeze, and a rubber plug. How do you guys do it?