Abstract
A pipet filler port has been constructed from a 1/4 in. NPT–1/4 in. or −3/8 in. barbed end Kynar plastic male connector fitting and a washer (cut from a latex rubber hose) inserted into the NPT end. The barbed end can secure reliably different sized rubber bulbs such as 1 oz (30 mL pipet capacity) and 2 oz (60 mL pipet capacity) types, and the 1/4 in. NPT end is fitted with a rubber washer that can provide airtight contact with the glass pipet end, permitting suction. This filler port allows for facile suction of a liquid using a pipet and also quick removal of the pipet bulb from the pipet end to permit setting the meniscus level with finger pressure. Existing supplies of rubber bulbs or new ones can be fitted with this filler port at just a few dollars for each bulb, avoiding the expense of purchasing new pipet bulbs with filler ports or thumbwheels. The plastic fitting should last indefinitely, and the rubber washer can be easily replaced if necessary.
Published Version
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