1. Matched pipe:water 20mm,1/2" 2. Chrome-plated ABS 3. Model Num: AR-07B Bathtub Air Controller1. Matched pipe:water 20mm,1/2"2. Chrome-plated ABS3. Model Num: AR-07B4. Bathtub accessoriesThere are more than 10 types of Air Controller to choose from.Thanks for viewing our website AR-07B Air Controller,20mm,1/2"matched