This barbed fitting is primarily used to connect 1/2" vinyl tubing to various places within the circulating/heating system or jets in a Hot Spring & Tiger River spa It simply glues into a 1/2" PVC coupling or elbow with regular PVC cement

Barbed adapter which is 1/2" male threads on one end and 1/2" barbed on the other

This barbed fitting is primarily used to connect 1/2" vinyl tubing to various places within the circulating/heating system of Hot Spring spa models

This barbed adapter is used in various places but primarily in the Moto-Massage niche for the small silicone Moto-Massage Jet air tube to slip onto on pre-1997 Hot Spring spa models

Barbed adapter 3/4 in x 1/2 spigot

Barbed adapter 3/8 in x 3/4 spigot