The Spacer Kit, part number 1108711, ships as two separate pieces and needs to be assembled before it is installed.
1.
Begin by inspecting the parts to make sure they are intact and the rubber seals are not warped or deformed
2.
Place the spacer body on a flat surface with the bottom (seal side) up
3.
Insert the check valve with the o-ring side down
4.
Press the check valve gently into the body of the spacer unit
5.
Your spacer is now ready to be installed, flip the spacer over and install the spacer into your faucet with the seal side down
Note: If the check valve is inserted backwards, no water will come out of the faucet