Markon Standard Top Draw Air Control - 6 Notch - Chrome

Markon standard top draw (air is sucked in from under the cap, above the spa shell) air control valve
The chrome cap can fully unscrew anti-clockwise.
46mm diameter cap
32mm hole required.
Plumbing connection
1. 0.5" / 15mm socket - suits 15mm pipe
2. 0.75" / 20mm spigot - suits 20mm fittings, or Markon 2 barb adaptor

Chrome is a coating applied through electrolysis to a base material such as brass or plastic. These parts are chromed plastic