I don't know about the "Python" branded one. But the Aqueon one you can. I broke the original one I got on the store. Chewy.com sells the whole main valve body assembly for like 10 bucks or so.
https://www.chewy.com/aqueon-water-flow-control-valve/dp/130985
https://www.chewy.com/aqueon-water-flow-control-valve/dp/130985