In the “Raspberry Boom” that I got as assemble-it-yourself parts some time ago (may no longer be sold?) there was a 3-way hose barb connector in the shape of an “F” that connects the two small tubes going to the differential pressure sensor, to one tube going to the outside world. The flexible tubes are about 4 mm or 5/32" in ID.
Does anyone know where I can obtain such a part? I have had difficulty finding a source. I can easily find 3-way hose barbs in the shape of a T or a Y, but that shape is much less space-efficient in an enclosure, if you want two of the tubes to be parallel with each other.