Does the tank remove? If so fill it n see if it leaks. Make sure to check ALL hoses n fittings end the pump. If it ever had water used in it im not sure id use it cause if the pups used you never know if it was winterized. You might just put a small amount of water like a gal and run the faucets but have towels and maybe a helper so you could watch the tank while they turn the sink on. If you only plan on using it as a hand washing n dishes id just use an outside water jug n pans.