Sometimes a part strays far from home. It gets hard to tell what faucet that stopper or valve came from. Well, just compare it to a screen or printout for easy indentification.
Aerator
  
Ceramic Valves
Drain Pop-Ups
Single-Control
Lavatory/Sink Valves
Spout Posts

Toilet Flush
Balls/Flappers
Valvet Valves

Compression
Valve Parts