Review on 90686 Coupling 88 1040 01 SVR 4510 4-Pack - Shop Now for Reliable Connections by John Ghattamaraju

I'm trying to build a shop vacuum system using 2-1/2" hose and fittings. I bought these couplers thinking they would work with this system. The hose is 2-1/2" OD and these couplings are also 2-1/2" OD so they cannot mate. If you buy these couplings to fit a 2-1/2". -To connect hose, C, gate or anything else, DO NOT BUY THEM!These couplings are the same size as the hose and other fittings.