Ordering Description Product number Description: Tweco 51 Gas Diffuser, Brass Product number: 1510-1101 Description: Tweco 51 Series Gas Diffuser, Brass, 11-23, 5 Per Pkg Product number: 1510-1100 Description: Tweco Robotics QTRW53-11 Gas Diffuser (300A) Brass, Robotic, 5 Per Pkg Product number: 1525-1141