All parts shall be pressure tested with water or air. Thosewhich leak equivalent to more than 25 drops of water per minute ona local area shall be rejected. Those which leak equivalent to arate of 5 to 25 drops of water per minute may be impregnated. Thosewhich leak equivalent to less than 5 drops of water per minute areacceptable without impregnation unless the leakage would be intothe induction system, or through an external surface, or throughthe walls of the coolant jacket, in which case they must beimpregnated. The purchaser's Inspection Department may vary thisrequirement after giving consideration to the use of the part, thelocation of the leaks, and other pertinent factors.