back of the waterpump oring size?

finally at the point where i can run my truck for the first time in 6 years since ive owned it and everytime i go to put coolant in it its leaking from another spot. i have everything tightened so its only comming from the back of the waterpump at the oring. does anyone know the size of it? the one i took out seems a little too big and it wont fit on the tube right and parts places dont list it per truck just size

most new water pumps you get from parts places come with that o-ring...you could either buy a new pump or pull one off the shelf to match up what size o--ring you need...

just a thought...

never thought of that thanks just in a bad mood i been workin on trying to get my truck runnin been runnin all over trying to find parts coolant leaks from a different spot everytime i fill it just put radiator since i didnt have one then i didnt have the coolant sensor then lower neck then back of waterpump oring i have shot for luck

if you buy the coolant inlet pipe gasket kit it comes with it. atleast it did for me when i just got one for the kia swap.