Low-cost disposable, sterile filter funnels for microbiological analysis testing, food/beverages, raw material, sterility testing and finished product quality. Polypropylene upper; high-impact polystyrene collar; CN membrane. Cat.No. 7-147 features gray, water quality cellulose nitrate membrane with white grid. The membrane turns black when wet, making it easier to detect and count growing colonies. Membranes meet U.S. Environmental Protection Agency (EPA) requirements for water quality work. Upper separates easily from lower for easy access to the membrane. Funnel adapter allows use with No. 8 stoppers (Cat.No. 7-DS0396-0080). Six funnel adapters included with each case. Also sold separately, Cat.No. 7-DS0397. Designed for single use only. Graduated.