I don't explain why I "like, agree, or thanks" for any posts, but you insist on an explanation for a "disagree", - for you, I will. You stated that the lower hose will only suck closed while driving. That is incorrect,. I have seen at least 3 sucked shut in my shop revving the engine. The most memorable one was an old Caddy, the lower hose was so oil contaminated, and soft, even with a pressurized system, it sucked shut, another was a Ford Falcon 6 cyl. I don't remember the third vehicle, just the hose, pass side. All were molded hoses, no spring. That's why you got the big red X. cheers