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This is a high quality, ventilated cap for test tube size M and L.
This sealing cap can be used instead of a sealing cotton piece. Especially when a colony is still very young (a few workers), breeding and feeding can take place in the test tube and this cap will come in handy. The cap can also be used well during periods such as winter rest.
The cap has a length of about 3.5 cm. The inner diameter is approximately 12 mm and the outer diameter approximately 19 mm. This means that the cap can be used for all test tubes up to a diameter of 18 mm.