How would you create a conduit like block?

at the moment i am creating a mars mod and i want to make a game function that acts like a conduit but lets you breath in mars instead of breathing underwater

i already have an idea of how i can make it work when around the conduit (when in radius of activated conduit it will set oxygen to true and when Leave radius of activated conduit it will set oxygen to false) but i don't know how i can activate it when the blocks are around it or how to create any of the block textures of the conduit