Note: If you buy this you will receive the latest version of the Cal Spa Air Control see second picture for the latest version.
This Part is a Cal Spa 1" Spa Hot Tub Complete Air Valve "Teardrop Style". The Valve Tear Drop Cap Width is approx. 3" and the Hole size in the tube would be 1 5/8" with a 1" slip plumbing commention on the bottom..
For help please see our YouTube video below.