When you find faucet adapter from us, the first thing is to identify the type of aerator. Secondly, measure the size.
Identify what's type of tap aerator
There are two types of aerators, which are Female aerator and Male aerator.
1. Female aerator

2. Male aerator

Measure aerator size
1. To measure Female aerator size, you need to measure inner diameter of the aerator.

2. To measure Male aerator, you need to measure outer diameter of the aerator.

1 comment
Not clear. On the female ur measuring the ID of threads. On the male it appears ur measuring the OD of the unit, not the threads. why would you not measure the OD of threads on the male??