Grooves on the outer surface of the washer allow the air displaced by the incoming milk to escape freely

·         Specially designed rubber washer is supplied with each pipet and is used to support the pipet in the neck of the test bottle

·         Scale is permanent brown stain

·         Marked “Sealed 3” for use in states requiring this special marking

·         Designed from ASTM Specification E1043, Type II A requirements

·         Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements