The hoses are soft and if the thermostat isn't open and the water pump is turning at a high rate of speed, a vacuum exists on the pump inlet side of the closed loop circuit. Being a soft hose without the spring it would collapse. Usually the lower hose is the only one that uses one as the top hose is the outlet where the vacuum doesn't exist. Never saw one in any equipment of any kind, water cooled.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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