REAN(A BRAND OF NEUTRIK AG) Stereo jack socket coupler. 1/4 inch stereo jack socket to 1/4 inch stereo jack socket. Priced and sold each.

Good quality connector - works perfectly

This feels really good quality and for me, part of that is the weight. It looks nice and fits both plugs nice and tight. I also use the Rean 1/4 plugs for my headphone patch cables and they're of the same good quality. Considering the price and how nice they look, there's no reason not to buy these!