With #7 Ace-Thred end valves that insure tight fit without grease. No stopcock plugs to pop out. Nylon bushing tightens into the internally threaded glass to form an O-Ring compression seal. Each bulb has a syringe sampling port and is supplied with two bushings, two FETFE O-rings and one septum. Plungers are supplied with size C hose connections. Special bulb capacities and plungers can be made to order. Complete item consists of bulb with two bushings, two FETFE O-rings, one septum, and two plungers.