This screw-in jet is used on some Wellis Hot Tubs.
Wellis part number: AJ00216
Dimensions:
Diameter of face: 85 mm
Height: 93 mm
Diameter of rear nozzle: 18 mm
Diameter of the thread : 39mm
Colour: PVC Stainless Steel
Connections: Screw-in jet
Temperature: 50 C°