Question 366General Subjects - Assistant Engineer

The correct answer is A) spring. The spring is used to maintain a snug interface between the rotating and stationary seal members in the illustration GS-0071. The spring applies a compressive force that keeps the seal members tightly pressed against each other, preventing leaks and ensuring a proper seal. This is a critical function for the effective operation of the sealing mechanism. The other answer choices are incorrect because: B) a notch and keyway are used to secure the seal in place, not to maintain the interface; C) a seal retaining ring is used to hold the seal in position, not to keep the interface snug; and D) a bellows is a flexible component used for other purposes, not specifically to maintain the seal interface.