When you got 12 mo. on them let me know.
I specifically didn't select a stiffer spring because it retards flow even more.
On my checkies, the brass body is the softer material and seats the SS ball, on the other, the ball seats against the SS jet.
The thing I don't like about the "in the jet" model is it is prone to Distort the spray pattern, the water coming through the spring whips into a cyclone and because it's so close to the actual precision orifice of the jet there isn't any room for the spray pattern to self correct. You will see this more and more as the jets wear.
With the 1/2" and 1" body on my checkies, there is room for the spray to straighten out.
Secondary, you push the jet 1/2" TO 1" closer to the carpet for less steam vapor in the room, and more heat Preservation to the carpet.
The checkies are serviceable, a 5/32 allen wrench allows the spring to be accessed and the ball and spring and inside of check to be cleaned. Also occasionally the many cycles of the spring opening and closing cause the little brass heck keeper to back off, just tighten them back down twice a year when you inspect to clean.
Jim could probably drop a teflon ball into one of his existing extensions and give that a run, it may work just as well.
