Balboa Hydroair Scalloped Air control – White. Some people have this listed with a 47mm cap, when it’s actually closer to 50mm. Has 10 dimples.
Details:
- Cap: 50mm OD
- Thread: 30mm
- Hole Size Required: 30mm
- Internal ID: ~21mm – Suits 15mm Pressure PVC
b-13678-aw