MONO-BALL WITH 2 VALVES Back Catalog number: 3911 Availability: In the manufacturer's stock Price on request - + Recommended 1131 RED CONICAL STOPPER - 12x9mm, h 18mm Price on request 362 PETRI DISHES 2 SECTORS, O 90mm (1 pc) Price on request 603 STACKABLE TANKS, 560x330mm Price on request