water pump

1972 318. the blow by hose came off and lossed all the antifreeez.

when putting back on, notice that inside the water pump hose housing it appears to have a check valve, or flow restriction type devide. 1/2 the flow seems to be cut off by a washer type device. is this normal or shoule it be removed or what. need some advice before i put it back together............ tks