I bought some used filter/pumps with tubing and accessories. They are intex cartridge filters 2000gph and 2500gph. Is this tubing pictured supposed to have a rubber seal or gasket? I have a leak on the suction side at the pump inlet on the one pump. And yes I am using a 2500 gph filter on a 1000 gallon pool lol. The factory supplied filter sucked err...didn't suck enough lol.