I have left a bottle pressurized for up to 6 months, but its always good to unpressurize them.
So what you want is an asa or well one of these ( http://www.zephyrpaintball.com/category/paintball_pro_shops.custom_products.custom_products_on_off_paintball_asa_s/ ). From there you run it into your reg, if I can I will get a pic of my rig.
Now the only thing is that there will be residual air from the mag to the reg, so if you have a quick disconnect set up there will be air loss.
To depressurize the bottle you can use the hose and us it as a key board cleaner.
So what you want is an asa or well one of these ( http://www.zephyrpaintball.com/category/paintball_pro_shops.custom_products.custom_products_on_off_paintball_asa_s/ ). From there you run it into your reg, if I can I will get a pic of my rig.
Now the only thing is that there will be residual air from the mag to the reg, so if you have a quick disconnect set up there will be air loss.
To depressurize the bottle you can use the hose and us it as a key board cleaner.