The NEOPERL PCA Perlator 0.5 GPM junior size insert fits both 13/16 in. – 27 in. junior male aerator and 3/4 in. – 27 in. small female housings. The pressure compensating design helps to maintain a constant and comfortable water flow regardless of pressure fluctuations. Male and female washers are included. This aerator features an anti-clogging white 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.Pressure compensatingAerated streamIncudes male and female washersFits any junior size housingSingle piece constructionANSI/NSF 61, ASME A112.18.1M