There are four connections to this standpipe. Does each opening serve different pipes inside the building, or is it possible to apply four times the volume of water when each opening is connected to a fire truck or hydrant?

Please visit my Etsy shop for my artwork for sale inspired by my autistic brother Mike at: 

https://autisminspiredart.etsy.com

My other artwork for sale is at: 

https://otherartbyjack.etsy.com