I'm glad I found this forum. One quick and odd question: In the past month or two the cap on my anti siphon valve came off twice. The first time I couldn't find the parts and replaced the whole thing. The second time it happened I found the cap and parts on the ground near the valve. Anyone have problems or heard of the cap coming unscrewed and falling off? Or has someone been removing the cap from the valve? If it helps, the problem is with a Lawn Genie 3/4" manual anti siphon valve. Thanks in ...