Greiner screw cap closure, for MicroTube, with O-ring

Greiner screw cap closure, for MicroTube, with O-ring, blue

Greiner screw cap closure, for MicroTube, with O-ring, green

Greiner screw cap closure, for MicroTube, with O-ring, natural

Greiner screw cap closure, for MicroTube, with O-ring, red

Greiner screw cap closure, for MicroTube, with O-ring, yellow