The NEOPERL Careguard 1.5 GPM 15/16 in. – 27 Male aerator is vandal proof with a laminar stream that is crystal clear in appearance. 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. The insert in this product incorporates the natural protection of silver. Agions silver prevents the growth of a broad range of microorganisms that could be caught in droplets of water within the faucet attachment. Patented single piece construction is virtually unbreakable. The Cascade design prevents lime buildup. Solid brass housing with a chrome finish.Cascade designVandal proofAnti- microbialContains Agion’s patented silver additiveCrystal clear laminar streamANSI/NSF 61, ASME A112.18.1M, CSA B125, AB1953, S-152, WaterSense