Renegade ユニバーサルポンプスリーブ - クリアペニスポンプスリーブ - NSN-1127-41

The clear sleeve makes it easy to see if you've got a good seal before you start pumping. It flexes enough to stay comfortable through a longer session, and cleanup takes about a minute under warm water.

Snapped right onto my 2.5-inch pump without any fuss, and the clear sleeve lets me see everything while I use it. Feels comfortable enough that I forget it's there.

Wasn't sure a universal sleeve would actually seal well, but this one fits my 2.5-inch pump snugly with no leaks. The clear material lets me keep an eye on things, and cleanup afterward takes about a minute.