Respro Powa / Sport Valve
The Powa Valve Pack contains 2 Powa Valves that can be used in the majority of Respro® Masks (with the exception of the Metro Mask). These valves have better breathing characteristics at higher airflows, i.e. when breathing heavily in sports or when engaged in strenuous physical exertion.
You can use Powa Valves with Techno Filters or vice-versa. The Sportsta Filter gives better inhalation characteristics over the City Filter and the Techno Filter.
This combined with Powa Valves is why the Sportsta Mask is perfect for use in sports activities.