Waterway / Aquatemp 1.5″ Spa Heater Split Nut
NOT the common size (2″ is most popular).
Found on 40mm / 1.5″ heater unions – on Dimension One spas and others.
OD = 72mm.
Thread = approx 63mm.
Sleeve collar internal diameter = 49mm.
Can be used to replace threaded nuts on LX H15 / H20 / H30 / H50 40mm heaters as well BUT must have the inner surface filed down to suit the wider diameter heater tube.
Does not suit 1.5″ threaded pump unions – heaters only.