Ordering Description Product number Description: Tweco 56S-H Gas Diffuser, Copper Product number: 1560-1101 Description: Tweco 56S-SW Gas Diffuser, Copper Product number: 1560-1100 Description: Tweco Robotics QTRW56SW Gas Diffuser (600A) Brass, Robotic, 5 Per Pkg Product number: 1564-1125