Waterway Plastics Extended Thread 3.5" Hi Flo Suction 1.5" S Elbow for Timber Hot Tubs - 484 lpm rated - White

Suits up to 50mm wall/stave thickness
This suction has a 484 litres per minute flow rating.
95mm cover diameter, projection into spa of 27mm.
Hole size required through spa is 60mm 
1.5" / 40mm socket elbow for plumbing connection

You will require 2 of these fittings per pump regardless of the strip skimmer - 484lpm rated - suits most spa pumps up to 1.5hp, maybe some 2hp - pumps rated with higher flow rates will require 3+ of these fittings.

These suctions are a custom special kit made up of multiple parts cut and made to fit in order to suit thick walled timber hot tubs.