The hose needs to be just large enough to require a bit of a push to slide it onto the fitting so it'll stay in place. You can use small clamps as well for added insurance if you wish. NAPA will have hose as should any FLAPS.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.