Just installed these rubber plugs with stainless steel bolts in my pool pipes for winterizing, and I'm impressed by how sturdy they feel. The thick rubber expands perfectly when you tighten the bolt - you can actually see it forming a tight seal against the pipe walls.

What surprised me most was how versatile they are. I initially bought them just for winter protection, but ended up using one during summer maintenance when I needed to block a return line. The rubber didn't degrade at all despite being submerged for weeks.

The stainless steel bolts are the real MVP here - no rust spots after months of exposure to pool chemicals. Installation takes literally seconds per plug; just insert, hand-tighten with the provided bolt until you feel resistance, then give it one more quarter turn with a wrench.

Pro tip: Mark your plugs' positions with tape if your pool has multiple drain ports. Makes spring reopening much easier when you can quickly identify which plugs go where.