... valve, durable and easy use.- Popular model among Senco rotary evaporators. Standard ModelR502DR503DParameters1Evaporating Flask (L)5L / F505L / ... h> 2L/h6Reachable Vacuum Rate< 133Pa (1.33mbar, 1 Torr)< 133Pa (1.33mbar, 1 Torr)7Bath Power (kW)2kW2kW8Static Temp. ... . A different experience-- Simple & RelexedSENCO, China made, Rotary Evaporator, Experiemental, Lab scale, Pilot Production, Water Bath, ...