Milwaukee 48-73-4011 Valved Respirator | Our valved respirators with gaskets are designed to help you stay cool while providing you with a better fit. The respirator valve reduces the construction mask's internal temperature by 10 deg F keeping you cool while at work. Milwaukee masks feature two soft adjustable straps and a flexible nose bridge allowing you to achieve a better fit. The respirator masks are ideal for non-harmful sanding, grinding, sawing and insulation particles.