Introducing the Portwest fit test adapter kit, compatible with all Portwest bayonet cartridge half masks and full face masks. This kit enables quantitative fit testing to be performed easily and accurately, providing confidence that the respirator fits the individual wearer. Position the adapter between the respirator facepiece and the P3 filter, and follow standard quantitative procedures using a Portacount particle counting device. The kit is supplied with an adapter, fitted with a small sample tube that passes through the inhalation valve of the respirator, taking a sample from the breathing zone, ensuring that you get reliable results.  The fit test adapter should only be used with P3 filters.