2" Split Nut for Spa/Hot Tub Heater, Parametric

thingiverse

I was the lucky winner of a free hot tub. Unfortunately, it was leaking heavily from both ends of the heater element tube. The culprits were something like these: https://www.poolpartsonline.com/p-103513-replacement-snap-nut-black.aspx. I also saw the split nut at http://www.aqua-man.com/row_num.asp?Ic=42894 as an alternative design. It seemed to be an easier design to copy and a lot faster than ordering it for $15 on Amazon. I designed everything in OpenSCAD and printed in ABS before wiping it down with ABS slurry and assembling it with 1/4"-20 hardware. You will still need a washer between the heater element and the PVC pipe the nut is screwing onto. I just reused the silicone washers that were previously there. The design is parametric so you can modify it for other hardware or for other heaters/pipes. Unfortunately, you cannot use the online customizer because I am using a thread library (see source object for link to it; I included a copy so you can just unzip the file download and immediately open it in OpenSCAD).