德國普發Pfeiffer DUO系列雙級旋片真空泵：
DUO2.5（Pfeiffer DUO2.5用于色譜儀前級泵；用于安捷倫質譜儀；應用于煙草局行業）
Duo 1.6
Duo 1.6M
Duo 3(舊款型號DUO 2.5)
Duo 3M
DUO 3 DC
Duo 5 M
Duo 6
Duo 6M
Duo 10 M
Duo 11
Duo 11M
Duo 20 M
Duo 35
Duo 35M
Duo 65
Duo 65M
Duo 125（舊款型號DUO 120）
Duo 125M
Duo 255(舊款型號DUO 250)
Duo 255M
