I upgraded the original PHSLT  to my PHSLT 2-  it fits more equipment.  Its stronger, thicker and threads adjusted.  This  coupling replaces the cracked/broken couplings on either end of your Intellichlor, or Hayward Salt Cells.   Fits the new, Paramount UV2- UV Sanitizer also.  This is also being used on Hot-Tub equipment. There are MANY Different,  Hot-Tub companies, I can't guarantee it fits your hot- tub. It does fit the Dura-jet pump.  It WILL make you smile when it goes on in seconds.  
THESE DO-NOT FIT the  Calimar  Salt cells.  IT is NOT FITTING BRAND NEW HAYWARD CHLORINATORS !!!    2026   Cells.     I have not changed anything on my mold.......
Only Hand-Tighten these couplings.  A wrench will damage the plastic, and be sure the O-Rings are still in place. It is best to just replace the O-ring.   Best to loosen the opposite coupler a few turns, and tighten both sides-  equally.     ( My first is still on my IC-40 since Dec. of 2019)
2" and 15/16th from Thread to Thread.