"type aa - air gap with unrestricted discharge" means a non-mechanical back flow prevention arrangement of water fittings where water is discharged through an air gap into a receptacle which has at all times an unrestricted spillover to the atmosphere....
"type aa - air gap with unrestricted discharge" means a non-mechanical back flow prevention arrangement of water fittings where water is discharged through an air gap into a receptacle which has at all times an unrestricted spillover to the atmosphere....