Description General description For great solvent/chemical resistance, the two 0-4 mm high vacuum valves have PTFE covers over the two Viton® O-ring on the shaft and one integral PTFE O-rings on the tip, without exposing any material other than PTFE to any solvents. Syringe port has a 4mm PTFE stopcock and a 14/20 outer joint. Delivery port has 14/20 inner joint. Grease-free design. Same as SYN264250 with 14/10 threaded joint and PTFE-lined septum for syringe access. Head only. Condenser and flasks not supplied. Access port has threaded 14/10 joint to accept a PTFE-lined silicone septum with a compression cap (supplied). Threaded 14/10 also accept regular 14/20 glass or PTFE stopper (not supplied). Similar to SYN134250 but with drip tip on the delivery port other than 14/20 inner joint. With 4mm straight bore stopcock in the upper portion for easy syringe needle access. Syringe port has 14/20 outer joint for a rubber septum and a 4 mm PTFE stopcock. Solvent is drained through 2 mm T-bore PTFE stopcock. The drainage arm has a 14/20 inner joint. Upper sampling port has a 4mm PTFE stopcock with a 14/20 outer joint for use with septa. Lower drain is centered to allow total drainage of storage head. Legal Information Synthware is a trademark of Kemtech America Inc. Viton is a registered trademark of E. I. du Pont de Nemours and Company