The Portwest P421 is a lightweight half mask for use with replaceable bayonet filters. Its body is moulded from flexible thermoplastic rubber, and twin filter connections sit either side of the face.
This dual-filter layout balances the weight of the mask and keeps a wide field of vision. A 4-point harness with adjustable straps spreads pressure across the head, and the mask comes apart quickly when it needs cleaning.
Key features
- Thermoplastic rubber mask body is durable and flexible, so it sits comfortably against the face
- Dual bayonet filter connections balance the weight of the mask and leave a wide field of vision
- ABS filter holders give the filters a rigid, secure mount
- Frontal exhalation valve lets exhaled air out of the mask
- 4-point plastic suspension harness spreads pressure across the head and is easy to clean
- Adjustable strap fastening lets you set the fit to suit the wearer
- Quick and easy to disassemble, which makes cleaning simpler
Materials and performance
Mask body in thermoplastic rubber (TPR), with ABS filter holders.
Standards and protection
Certified to EN 140: 1998 and classed as CE Category III personal protective equipment.
Filters
Filters are sold separately. The mask is compatible with a selection of Portwest bayonet filters, so you can fit the filter type your task requires.
Care
Follow the care instructions on the label.




















