An air supply system comprising: a one-piece manifold body having a top side, a bottom side opposite said top side, a front side extending between said top side and said bottom side, and a back side opposite said front side, said one-piece manifold body further comprising: a first stage regulator chamber extending through said manifold body from said front side to said back side; an air channel; an outlet channel in fluid communication with said first stage regulator chamber; and a first stage regulator operatively engaging said first stage regulator chamber, wherein said first stage regulator extends horizontally through said first stage regulator chamber from the front side of said manifold body to the back side of said manifold body; characterized in that said one-piece manifold body further comprises: a plurality of bottle ports each configured to removably receive a bottle of pressurized air, wherein the air channel is in fluid communication with said bottle ports and said first stage regulator chamber; and a quick disconnect fitting port configured to removably receive a quick disconnect allowing connection of an external source of pressurized air and deliver said pressurized air to said plurality of bottle ports and to said outlet channel through said first stage regulator chamber. a one-piece manifold body having a top side, a bottom side opposite said top side, a front side extending between said top side and said bottom side, and a back side opposite said front side, said one-piece manifold body further comprising: a first stage regulator chamber extending through said manifold body from said front side to said back side; an air channel; an outlet channel in fluid communication with said first stage regulator chamber; and a first stage regulator chamber extending through said manifold body from said front side to said back side; an air channel; an outlet channel in fluid communication with said first stage regulator chamber; and a first stage regulator operatively engaging said first stage regulator chamber, wherein said first stage regulator extends horizontally through said first stage regulator chamber from the front side of said manifold body to the back side of said manifold body; characterized in that said one-piece manifold body further comprises: a plurality of bottle ports each configured to removably receive a bottle of pressurized air, wherein the air channel is in fluid communication with said bottle ports and said first stage regulator chamber; and a quick disconnect fitting port configured to removably receive a quick disconnect allowing connection of an external source of pressurized air and deliver said pressurized air to said plurality of bottle ports and to said outlet channel through said first stage regulator chamber. a plurality of bottle ports each configured to removably receive a bottle of pressurized air, wherein the air channel is in fluid communication with said bottle ports and said first stage regulator chamber; and a quick disconnect fitting port configured to removably receive a quick disconnect allowing connection of an external source of pressurized air and deliver said pressurized air to said plurality of bottle ports and to said outlet channel through said first stage regulator chamber.