Lay-Z-Spa Spanner
thingiverse
This will fit the connecting collars on a 77mm outside diameter Lay-Z-Spa collar. Struggled to undo the inlet and outlet pipes on occasion and getting a watertight seal. This makes both those things effortless without putting undue strain on the plastic parts. Do not overtighten, I am not responsible for any damage you may cause if you do! For strength I printed using PET-G with 80% infill and it's seriously tough. You could probably get away with less infill to be honest! The version I uploaded is 20mm shorter than pictured to give clearance between the two pipes.
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