APPLICATION: All parts shall be pressure tested with water or air. Those which leak equivalent to more than 25 drops of water per minute on a local area shall be rejected. Those which leak equivalent to a rate of 5 to 25 drops of water per minute may be impregnated. Those which leak equivalent to less than 5 drops of water per minute are acceptable without impregnation unless the leakage would be into the induction system@ or through an external surface@ or through the walls of the coolant jacket@ in which case they must be impregnated. The purchaser's Inspection Department may vary this requirement after giving consideration to the use of the part@ the location of the leaks@ and other pertinent factors.