Our 20L PTFE Oil Seal Set fits our 20L RE-1020 rotary evaporator systems. These seals are made of PTFE to provide excellent resistance to solvents. RE1020OSS SPECS Capacity: 20L / Liters Connection Size: #95 Seal Size ID 48mm | OD 95mm | Width 10mm For Technical Support, Questions, or Other Issues Please Email or Call Us!