This NEOPERL 1.2 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 pink dome screen that filters sediment. The patented single piece construction is virtually unbreakable and lime resistant. Aerated stream and a solid brass housing with a Brushed Nickel finish.Pressure compensating1.2 GPMFemaleBrushed nickel finishLead freeANSI/NSF 61, ASME A112.18.1M, CSA B125, AB1953, S-152, CEC, WaterSense