6540-685 Jacuzzi Spa Gravity Drain Fitting Locknut, Heater Return/Accu-Pressure. 2002+. Measures 1 3/4 Inches O.D. This Nut Also Used On BX Jetback, Part Number: 6541-231 And 6541-230.
USED IN:
Heater Return Assembly Diagram (2002+)
BX Jet Assembly Diagram
Ozone Fitting Assembly Diagram (Pre-2001)