2 Pcs Rubber Pipette Filler, 3 Valves Lab Pipette Filler Bulb, Three Valve Safety Pipette Filler

Easy to use in lab analyses

Got this to use with my pipettes that came with bulbs. Those bulbs were very hit or miss, often not filling the pipette to its maximum markings.I've used both of these so far, and they fit all my sizes (from like 1 mL to 10 mL) with no issues. They work great.

Comes as a package of two. Product is as advertised and fits the pipettes properly. However, one of the three values on one of the bulbs is very stiff and (perhaps malformed?) and difficult to compress. The other valves work fine. And, the second bulb is perfect for my use, so generally I'm happy to use this product for back sweetening a batch of wine.

I read the reviews yet decided to try the bulbs. My take on the item is good rubber material but poor valves on the "s" suction and "E" escape valves. I am no weakling but could not get those valves to open pressing with all my might using one hand. I needed two hands pressing four fingers to get them to operate. This is too risky pipetting in glassware or dangerous chemicals. I understand why people said the valves were defective. Well they did work but hurt my fingers from sustained pressing. I gave up returned the item and purchased a brand name item. I had just wished those valves operated like the "A" Air valve did.

Did not work as hoped

Product was shipped and delivered very quickly and was made of good quality materials.Thank you !

Way cheaper than VWR and seem to work the same as other of these for pipetting.

One pipette bulb worked while the 2nd did not allow the liquid to be expelled. It appears that the opening to the empty valve is not open to the atmosphere.