Australian Spa Parts

All Onga Classic air controls now come with 2 barb adaptors
The 1" Onga Air Control Adaptor supplied in years gone by for spa pool applications with 25mm / 1" manifolds, is no longer available.
50mm diameter cap, 26mm diameter hole required 
If you need an air control with ability to add a manifold with more than 2 x barbs, you will need to redrill the spa shell to suit any other air control listed with a 1" / 25mm socket to suit manifolds.