Developed in conjunction with leading research facilities, the Rodent circuit is the most effective, user-friendly, mask for rodents. Available with 3 different size diaphragms, the mask easily fits most rodents. With the use of a C-Pram circuit shown below, the mask is designed to deliver and evacuate the gas through one tube. Traditionally, the open mask system has caused problems because of the contamination of waste gas to the staff and the patient rebreathing CO2. These problems are avoided with the Rodent circuit and mask design. When combined with in-house suction or the Lab Animal Evacuation System or F/Air canister, see page F19, there is minimal risk of untoward anesthetic agent exposure for the researcher. Inlet tubing: 6.25 mm (0.25 in) ID, silicone tubing. Outlet from rodent circuit is a 22 mm (0.866 in) respiratory fitting. Respiratory Adapters are available to connect the rodent circuit outlet to tubing of various sizes from 6 to 15 mm ID, see page F22.