How to attach washing machine drain hose to extension?

How to attach washing machine drain hose to extension?

Hi my washing machine is too far away from the drain outlet, so there is an extension hose which is connected to the Spigot (see pic) My old machine broke so connecting a new one. I would point out the new one is a second hand old top loader. Is it normal for the drain hose to smell badly. Im worried it shouldn’t be connected to the spigot, just in case it is back flo etc. Also, the new machine drain hose (black hose) is difficult to attach to the extension hose.