Make sure that you are placing the hose grommet firmly on the hose before inserting the hose into the hose connector. You may wish to use two hose grommets (instead of one) for additional support and stability. When using a non-rotating hookah, be sure to turn the hookah when necessary to minimize the strain on the hose. Don't be afraid to insert the hose firmly into the hose connector, and a slight twist while inserting may help tighten the connection. A trick you can use to thicken the hose grommets up to get a better seal is to wrap tape around the outside of the hose grommet. You can also wrap tape around the end of the hose as well, which will create a tighter connection when the hose is placed in the hose adapter.