1) 3-way: It consists of two inlets & one outlet.

Uses:
- It is commonly connected to the IV cannula where through one inlet IV fluids pass and through the other inlet medications can be given or Central venous pressure(CVP) can be monitored.
- Aspirating fluid from the body cavities.
- Exchange transfusion.
2) IV cannulas:
Size: 14G – 24G (Smaller the no., larger the bore of the needle)
Use:
- Venous access for longer period.
- IV fluids
- Drugs administration
- Collection of blood samples
Source: Internet
