This is the HOSE that connects the Vacuum Breaker to the Fixture
The length is about 24" long with female couplings on each end
The hose is 3/8" inside diameter (ID) 250 PSI

* 1/4" pipe thread Connectors on the ends of 24 inch long hose (standard for the industry) 

Some other brand fixtures require below fitting.

May also need this adapter

to connect some shampoo bowl fixtures (with 1/2" male outlet) to the spray or vacuum breaker hose: