Proteam 100597 backpack foam sound muffler replacement is a commercial-strength, rugged exhaust sound muffler specially designed for Proteam backpack 10 quart vacuums. Unlike whimpy cheapy backpack exhaust sound mufflers that break way, way too fast . . . causing you and others exposure to potentially dangerous high decibels . . . this gets the job done. Top Choice: Hospitals, Class A Offices, Resorts & Hotels, Airports, Nursing Homes, Stadiums, Theaters, Restaurants, Churches, Universities, Fitness Centers, Schools, Manufacturing, Museums, Retail Stores, Amusement Parks, Military, etc. Black. 6 replacement foam sound mufflers per kit. Buy 4 -- Get 2 Free bulk pack. 10 quart. When safety and health of others (including your own) matters more . . . .