Edgetec / Decina Triflo spa bath air bleed. Supersedes all earlier versions of all Edgetec Triflo spa bath pumps including the red "twist" style air bleeds and blue capped versions. 

The red-capped version is discontinued and no longer available at all. The new version replaces it.  

To activate the new style air bleed, drill a small hole inside barb, as per . 

E-9-2013