The Drain Pipe
Your only option to install a for a bathroom sink starts with the drainpipe. It has to have a black hole or receiver to accommodate a pivot rod with a ball on the end into it. If you have PVC plumbing with no drainpipe adapter for the pivot rod, you'll either have to replace the pipe with one that does, or use a manual drop-in stopper.
The Faucet
The will need to be the lift rod for the pop-up stopper. This may either come equipped with the faucet set, stopper assembly included, or at least have an accommodating hole at the top center of the faucet assembly for one.
The Stopper
The stopper assembly is comprised of four simple parts. The lift rod (on top of the faucet), the clevis and spring clip, the pivot rod and the stopper. The stopper will have a small loop at the bottom of it.
Insert the stopper into the drain lining up the loop at the bottom through the ball end of the pivot rod. Next, you would attach the lift rod of the sink to the clevis. Commonly, the lift rod is threaded on one side and screws into a threaded bracket at the top of the clevis, but there may be other methods of attaching the two. The clevis may have a few different options to accommodate the end of the pivot rod and this would be how much you want the stopper to pop up and how far it needs to go before stopping the sink. Choose the hole that suits the needs of your particular sink. Lastly, attach the spring clip to the pivot rod and then through the clevis to connect the assembly.
Tags: accommodate pivot, clip pivot, equipped with, faucet assembly, loop bottom, pop-up stopper, spring clip