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 - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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