A nozzle plug for a deluge fire protection system having nozzles connected with a pipe network, the nozzles having a pipe connection with a nozzle chamber and a nozzle orifice allowing for the flow of water toward a deflector for dispersal, includes a plug body configured to fit within the nozzle chamber and/or nozzle orifice and form a seal of the nozzle orifice; a deformable component connected with the plug body configured to retain the seal of the nozzle orifice up to a predetermined pressure level above atmospheric pressure within the pipe network and to deform when a current pressure with the pipe network exceeds the predetermined pressure level and release the seal of the nozzle orifice to allow for the flow of water through the nozzle orifice; and wherein the deformable component is configurable to calibrate a deformation point corresponding to the predetermined pressure level.