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Welch™ DuoSeal™ High-Vacuum Pumps

Rugged, durable pumps are ideal for demanding applications such as Schlenk drying lines, freeze drying, vacuum distillations, concentrating and degassing

Manufacturer:  Welch™ 1399B01

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Catalog No. 01-103

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Includes: V-belts, pulleys, belt-guard, oil supply, 3-wire cord (except 01-105-1 which must be conduit wired), plug, inline switch and instructions.



The ruggedness is a result of reduced frictional wear (less than 580rpm vs. typical 1750rpm direct-drive pumps) and high contamination tolerance (contaminants diluted due to large oil capacity).

  • Dual-voltage models come wired for lowest voltage listed in specifications chart; may be converted to higher voltage listed by rewiring
  • Wiring diagram supplied with each model
  • All models are single phase

1International Model for 115/230V 50Hz available on special order.



1.5 x 10-2 torr
0.3 hp
61 lb.
5.9 A
750 rpm
28 kg
60 Hz
25.4 cm
43.2 cm
High Vacuum Pump, One-Stage
2 Pa (1.5 x 10-2 torr)
115 V
28 kg
V-belts, pulleys, belt guard, Oil supply, 3-wire cord, N. American 115V plug, inline switch and instructions
115 V 60 Hz
61 lb.
1.2 CFM
10 in.
17 in.
9 in.
Concentrating and Degassing, Freeze Drying, Schlenk Drying Lines, Schlenk drying lines, freeze drying, vacuum distillations, concentrating and degassing, Vacuum Distillations
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