Here's one more option that we use. Locate a plumbing (faucet) O-Ring that will fit snugly on the stopper. Slide it on the stopper from the bottom up to near the top, leaving it so it keeps the drain plug open as high as you want it.
This lets the water drain but stops your rings, etc. from passing thru.
Not my idea as it came from this forum a few years ago. It works!
2014 Jayflight 24FBS Elite
2009 F150 Supercab, 5.4L ,3.73, HD Tow Package, Equal-i-zer 1K,
Progressive EMS-LCHW30, TST 507RV TPMS, Hydro Life HL-200, Maxxis 8008.
Best friend wife and dog Cooper. RETIRED 6/30/16. WOOHOO! Now the "endless summer" begins.