water valve !!!!

Hi guys. My 72 Scamp is leaking from the heater water valve. The car is also a A/C car and I cant find one that looks like mine. Just one in and out outlet. The ones on ebay and year one are 2 to 2 or 2 to 1. mine must not be the correct one. any ideas,
By the way, i put the massive heads 2.02 on the dart you guys helped with and shes a beast!!! Thanks!