Notice the large extension on the ball valve relief spring well. It is required to house that big and huge spring that is needed to keep pressure on that 3/4 inch ball bearing that acts as a pressure relief for the pump.
Title: Notice the large extension on the ball valve relief spring well. It is required to house that big and huge spring that is needed to keep pressure on that 3/4 inch ball bearing that acts as a pressure relief for the pump.