The Snap-Cap™ diffuser consists of two simple parts, the support base and a flexible snap-on check diaphragm. During aeration, the diaphragm lifts from the base, allowing the air to exit through the orifices in the diaphragm. When air stops, the diaphragm is instantly sealed against the base by the pressure head of liquid, preventing backflow and clogging. The unique edge design of the diffuser locks on the removable diaphragm to avoid blow off during unusual pressure surges. Diffusers are available with 3/4” and 3/8” NPT threads in Celcon plastic base and stainless steel models. Model 750 diffusers will handle air flows to 10 CFM. Model 375 diffusers will handle flows to 5 CFM.