Ordering Description Product number Description: Tweco HD54-16 Gas Diffuser, Brass Product number: 1540-1136 Description: Tweco HD54-14 Gas Diffuser, Brass Product number: 1540-1135 Description: Tweco 54AL Gas Diffuser, Brass Product number: 1540-1110 Description: Tweco 54A-16 Gas Diffuser, Brass Product number: 1540-1104 Description: Tweco 54P Gas Diffuser, Copper Product number: 1540-1103 Description: Tweco 54A Gas Diffuser, Brass Product number: 1540-1100 Description: Tweco HD54-EL Gas Diffuser, Brass, Eliminator, 5 Per Pkg Product number: 1540-1137 Description: Diffuser Product number: 1543-1106 Description: Tweco Robotics QTRW54 Gas Diffuser (400A) Brass, Robotic, 5 Per Pkg Product number: 1544-1125 Description: Tweco Robotics QTRW5416 Gas Diffuser (400A) Brass, Robotic, 5 Per Pkg Product number: 1544-1126