It is quality product but unfortunately it didn’t fit my hose. I guess there are multiple sizes. Who knew.It a coupler... either it works or it doesn't and my experience with the product was satisfactoryFits perfectly with the pool skimmer tubingGood qualityThese couplers are for 2" vacuum hoses, so I'm having to return these like the first order. The description plainly says they are made to fit 1-1/2" vacuum hoses. I do not recommend buying these for 1-1/2" vacuum hoses because the couplers are to large. They would fit a 2" vacuum hose just right.