HotSprings Watkins Hot Tub Spa Massage Jet Screw Cover.
thingiverse
This replacement screw cover fits a Watkins HotSprings MassageJet Hot Tub Spa made in 1985 for the JetSetter 2-3 person model, and will probably work with similar models from that era as well. ABS will generally last longer than PLA, so keep this in mind when choosing your material. Fit hasn't been tried yet, but it may differ depending on the specific printer used.
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