metooblam

alright so i got my intake and i disconnected the hose from the head to the intake and it is connected to another vacuum hose, its the coolant hose. does anyone know what size the hose is? i need to buy a coupler to join the 2 hoses, i went to the injen website and says it comes with 1/4 coupler but i bought a 1/4 inch and it didn't fit i would measure the hose but i don't have it right now its in the shop, please help.