Four-way Stopcock vs. Three-way Stopcock

Sometimes we’ll get a customer question about our Luer stopcocks that goes something like this:  Your website lists 4-way stopcocks, but the stopcock in the picture only has three ports. Do you carry a 4-way?

The answer is: YES, the one with three ports is a 4-way!


The stopcocks are called 4-way because of the flow options rather than the number of ports. The best way to visualize this is to focus on the handle positioned at 12 o’clock, 3 o’clock, 6 o’clock and 9 o’clock. Each one of these positions opens the ports differently to create the four different flow options as seen in the graphic.

So, yes! We stock 4-way stopcocks, and the name is appropriate when considering the number of flow options they provide.