Low Profile Drain 3-quarter barb connection WHITE

Best to use a plumbing cleaner then pipe cement to assemble. Vinyl pipe pushes over the top of the connection then glue and then a metal clip to hold in place.

Assemble through the spa shell with silicone you can use a gasket instead of the silicone but not both together as this often causes the gasket to spurge out the side and would cause a leak.