I think that’s the same cap as on mine, PLX-102-229, David. My recent looks online imply there’s basically two caps made for Aqua/HydroHots, and one has a “D” ring or “ bail” on top: PLX-403-000. That one is pretty obvious, making it easy to tell which cap any of us has.
Joel
Addendum:
Now for our daily dufus handyman update. Having struggled for hours trying to get a 7/8” socket over the float switch, even an Autozone trip for a 1/2” deep socket to better accommodate its two wires, today I almost cut a notch in the side of that socket to pull the wires clear.
But before that, I cleared away crushed insulation foam from around the switch base. Nope, that wasn’t it. Feeling in there with my fingers, I could swear the socket was too small. But, no, the website and other documents I have all said the older units used 5/8” and mine should be 7/8”. I tried Fred’s ‘wrap wires around screwdriver’ trick. Nope after countless rewrap attempts, jamming the wires deep into the large 7/8” half-inch drive socket.
Frustrated by both that and the position this old body had to take for the job, I finally swore the da#*@! bolthead just had to be bigger than 7/8”. So I dug out a 15/16” socket, but just strung the wires through it since I don’t have a deep one in that size, and wasn’t connecting the wrench. Sure enough, even free of clogging wires, it wouldn’t go over the bolthead! Okayyyy....
Out comes the 1” socket. Bingo! Slid right over the bolthead and is snug.
Lesson: when they say the switch is 7/8” they mean the threads, Dufus. NOT the wrench size.
So now, off to the Ace or Autozone for a half inch drive, 1” deep socket. And hopefully wires will stuff in enough for the socket to slide over the bolthead. The old one, no biggie, but I don’t want to risk damage to the wires on a new $150 switch. If necessary, I can still cut a gap in the socket side.
-Dufus