The EZ-Fit™ Filtration Unit is available in 100 mL or 250 mL funnel sizes. The shape of the funnel and the plastic material minimize sample residue to ensure that the complete sample volume reaches the membrane surface. The design reduces the risk of leaks and prevents sample from by-passing the membrane to allow filtration of the entire volume. The EZ-Fit™ Filtration Unit is presterilized and the lid remains in place during filtration to prevent contamination. To further maintain sample integrity, a rim prevents forceps from accidentally touching the membrane filtration area during transfer. To facilitate operation and save time, the EZ-Fit Filtration Unit allows one-handed funnel removal. In addition, the clear funnel with a larger diameter enables easier sample pouring and visualization of the end of filtration.