32496580 is the complete piston and pin assembly used on the low pressure side of the 2545 Ingersoll Rand air compressor pump.
32496580 is for the low pressure side of the 2545 pump only. If instead you need the high pressure piston, you would want to purchase item 32496614
This is an OEM part from Ingersoll Rand.
Part #: 32496614
Part #: 32012957
Part #: 32307084
Part #: 32307126
Part #: 32319477