This NEOPERL 1.0 GPM PCA Aerator is a female 55/64 in.-27. The pressure compensating design helps to maintain a constant and comfortable water flow regardless of pressure fluctuations. This aerator also features an anti-clogging blue and clear dome screen that filters sediment. The patented single piece construction is virtually unbreakable and lime resistant. Aerated stream provides a soft to the touch feel. A solid brass housing with a Chrome.