Techcon 400 Series Air Powered Rubber Stopper, 6cc

Description

The back end of a 400 Series syringe barrel needs a stopper that seals against air pressure without letting fluid weep past, and this rubber piece is one of the dispensing valve parts sized for the 6cc air powered configuration. It seats inside the open end of the barrel opposite the dispensing tip, sealing the chamber so regulated air pressure pushes the fluid forward instead of leaking around the plunger.

Where These Dispensing Valve Parts Get Used

Air powered 400 Series barrels run on bench dispensers and automated cells where consistent shot size depends on a tight seal at the back of the barrel. As the stopper cycles under pressure, the rubber compound wears at the point of contact with the barrel wall, and a worn stopper lets air bypass the seal, which shows up as inconsistent bead size or a barrel that will not hold pressure between shots.

How These Dispensing Valve Parts Hold Up

The stopper is molded from black rubber sized specifically to the 6cc barrel bore, giving a snug fit that resists blow-by at typical bench dispensing pressures. Because it rides inside the barrel with every cycle, it is a routine wear item, and keeping spares on hand avoids a mid-run stoppage when a stopper finally loses its seal. Matching stopper size exactly to barrel bore matters more than it might seem: an undersized stopper allows air to bypass the seal entirely, while an oversized one can bind and tear during insertion.

Order this stopper as a direct replacement when an existing 400 Series barrel starts losing pressure or dispensing inconsistent bead volume. Pair it with barrels and plungers from our dispensing, mixing, and nozzle accessories category. Techcon’s full 400 Series parts range is on its manufacturer site.

Need Help?

Need help matching stopper and plunger sizes to your syringe barrel? Call (800) 220-1966 or email [email protected].