Problem? Having difficulty identifying the type of aerator that you need? Solution: The Water and Energy Saving KIT. This kit can then satisfy the demand for :- Standard M22 Female, M24 Male, Rompigetto M22, M24, JR Male Female. Neoperl see this product that is packaged in a degradable poly bag as being compatible with 85% of existing screwed/threaded tap outlets. This product can be bulk purchased. Ideal for hotels and buildings with varying types of threaded outlets.