White PP. Designed for use with NALGENE culture vessels. These 38-430 barbed PP closures accommodate 6 or 13 mm tubing (inner Ø). May be used with any NALGENE container with a 38-430 closure with ports (Cat. No. 2600) and culture vessel mixing system (Cat. No. 2602), these 38-430 PP closures are pre-drilled for a 6 or 13 mm barbed bulkhead fitting. For fluid transfer on NALGENE containers with 38-430 closures. Components come unassembled. Autoclavable.