The commenter that said they wished they made a female STC coupling for the hose end of the HPOP: You don't need one! I know, I thought the same thing based on what I read in their 'how to' thing. Reading and comprehension isn't my strongest suit, but it does say "Once one line is removed, install the HPOP gauge on one line, and the STC Quick Connect Male Cap on the other line."

However! What they meant to say was put the STC Quick Connect Male Cap on the pump side.

You undo one HPOP hose from the block and the other hose you undo from the HPOP itself. The guage goes on the hose end and then you put this STC Quick Connect Male Cap on the pump. Don't forget to deadhead the IPR as well (Riffraff also makes a tool for this), and you'll have everything you need to figure out if you've got a bad or good HPOP.

Just thought I'd throw this out there in case other folks were thinking the same as me! Hope this helps.

Top notch products from clay

A must if doing HPOPs often for getting them in out without slimming out customer engine bays.

also great for storingused HPOPs

Worked well, cheaper than OTC, wish they had the female end as well for dead heading pump lines, and adapters for OIL gauges.