B294 Foot Switch Assembly Replacements for Model 300 and 533 Pipe Threader ORS NASCO KleenGuard™ A20 Breathable Particle Protection KleenGuard™ A20 Breathable Particle Protection Shoe Covers are designed to move with you – and your employees – while helping protect against hazardous and non hazardous dust The A20 fabric is comprised of five layers of stacked barrier protection (SMMMS) against hazardous particles Popular choice for dusty environments such as laboratories and remediation Features triple toe and quadruple rubber heel reinforcements Breathable airmesh lining with CR Flex foam insulation provides all day comfort Steel toe protects feet from dropped objects Safely and quickly starts and stops the machine by depressing or releasing foot pedal Durable replacement foot switch assembly Designed for use with Ridgid® Models 300 and 535 Pipe Threading machines