This replacement connector kit fits various double-barrel-style heaters, including the No-Fault heater manufactured in the USA by Watkins. These heaters are found on Hot Springs.
The kit contains 2 screw-in barb connections, and their o-rings.
Dimensions
Length : 44 mm
Thread diameter : 28 mm
Connection
Outer diameter of pipe fittings: 21 mm, for 3/4" pipe