"What do you mean when you say '1 piece' and '2 piece' pop-up assemblies? Don't these all have more pieces than that?"
One-piece or two-piece refers to the pop-up body that attaches the sink to the drain pipe. The 1 piece body has the fitting for the pop-up lever in the part that is installed when the drain flange is installed, thus making the alignment to the pop-up rod more difficult than the 2 piece.
The 2 piece body has the fitting for the pop-up lever in a separate part that is installed after the drain flange has been installed, making the alighment with the pop-up rod much easier.
"What is ABS pipe?"
Acrylonitrile Butadiene Styrene (ABS) pipe is mainly used for drain, waste, vent and sewage applications.
"What do you mean by "PVD" polished brass?"
"PVD" stands for "Physical Vapor Deposition" which is a modern plating process used in faucet manufacturing. Vaporized zirconium reacts with nitrogen and other gases to form a VERY durable plated surface. Unlike polished brass finishes in the past that would easily tarnish over time, polished brass finishes with PVD are extremely durable and won't generally tarnish or discolor.
"Are the brass and antique finishes as durable as chrome?"
No, we like to recommend only chrome finishes as they will not tarnish with proper care.