This kit is an Air Bleeder barbed plug and Silicon sealer usually used on a Waterway Hot Tub Pump Face to bleed the air off the pump while filling the tub up. I have seen these fittings in many brands just compare the pictures and measurements with your current fitting. This barb is usually replaced because the barb is broken off and leaking. Note: This Part is used on Waterway Wet Ends I offer other brands as well for Aqua-flo and more in our eBay store… 

 

55-270-2077, 672-4350, 413-12

Barb Fitting Type Barb Adapter
Barb Size 3/8"
Barb Type Barb (b)
Plumbing Connection Size 1/4"
Plumbing Connection Type Male Pipe Thread (mpt)
Manufacturer Waterway