NEOPERL’s Perlator 1.5 GPM 55/64 27 in. regular female aerator is flow restricted. The exterior rotating sleeve of the aerator can only be installed and removed with a key so it prevents tampering. This makes the aerator ideal for use in bathrooms in commercial and multi-family buildings. This aerator features an anti-clogging green 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. Solid brass, lead free housing with a chrome finish.Aerated streamVandal proofSolid brass with chrome finishLead freeANSI/NSF 61, ASME A112.18.1M, CSA B125, AB1953, S-152,WaterSense