With the baffle installed in the top tank of the radiator sometimes it is difficult to see exactly how much water you have in the radiator. Using the special 'T' fitting remove the petcock from the water outlet pipe, and install the petcock onto the 'T' fitting. This new 'T' fitting then screws back into your water outlet pipe. Push the clear tube onto the brass adapter and run the tube up the side of the radiator and attach to the radiator support rod. Insert the bleeder valve into the end of the tube. Push the plunger down to let the air out and the coolant will rise up and show you the level. Made in the USA.