A combination of a self-sealing safety valve, a container of pressurised fluid, and a dispensing valve the self sealing safety valve comprising a substantially solid body and attachment means for connecting to the dispensing valve, wherein the self-sealing safety valve includes a substantially central bore extending through both the attachment means and the solid body, the bore connecting an inlet to an outlet; wherein the bore comprises three parts, each of a different diameter: a first part immediately adjacent the outlet has a first diameter; a second part located immediately adjacent the first part has a second diameter that is wider diameter than the first diameter; and a third part located immediately adjacent the second part has a third diameter that is wider than the second diameter; wherein the second part of the bore housings a first biasing means and the third part of the bore housing a sealing ball and a second biasing means, the sealing ball being located between the first and second biasing means, and wherein the diameter of the sealing ball is greater than the second diameter but smaller than the third diameter and is capable of sealing said second part of the bore; wherein under normal flow conditions of fluid through the bore, the first biasing means is configured to bias the sealing ball away from the second part of the bore, and under conditions of high pressure fluid flow through the bore, the sealing ball is forced towards a junction between the second and third parts of the bore, against the first biasing means, sealing the outlet; wherein the self-sealing safety valve is located inside the container of pressurised fluid; wherein the substantially solid body of the safety valve comprises a tapered external wall and the angle of the tapered wall of the safety valve corresponds to a taper angle of an opening in one end of the container that is adapted to receive a dispensing valve; wherein the dispensing valve includes a tapered wall which is threaded externally and the angle of the tapered wall of the dispensing valve corresponds to the taper angle of the opening and the taper angle of the external wall of the safety valve, which opening is threaded internally for attachment of the dispensing valve thereto; and wherein the external wall of the self-sealing safety valve sits against the tapered opening of the container and wherein the attachment means of the self-sealing safety valve comprises an externally threaded end portion shaped and dimensioned so as to be received by a complementary internally threaded portion of the dispensing valve. wherein the bore comprises three parts, each of a different diameter: a first part immediately adjacent the outlet has a first diameter; a second part located immediately adjacent the first part has a second diameter that is wider diameter than the first diameter; and a third part located immediately adjacent the second part has a third diameter that is wider than the second diameter; wherein the second part of the bore housings a first biasing means and the third part of the bore housing a sealing ball and a second biasing means, the sealing ball being located between the first and second biasing means, and wherein the diameter of the sealing ball is greater than the second diameter but smaller than the third diameter and is capable of sealing said second part of the bore; wherein under normal flow conditions of fluid through the bore, the first biasing means is configured to bias the sealing ball away from the second part of the bore, and under conditions of high pressure fluid flow through the bore, the sealing ball is forced towards a junction between the second and third parts of the bore, against the first biasing means, sealing the outlet; wherein the self-sealing safety valve is located inside the container of pressurised fluid; wherein the substantially solid body of the safety valve comprises a tapered external wall and the angle of the tapered wall of the safety valve corresponds to a taper angle of an opening in one end of the container that is adapted to receive a dispensing valve; wherein the dispensing valve includes a tapered wall which is threaded externally and the angle of the tapered wall of the dispensing valve corresponds to the taper angle of the opening and the taper angle of the external wall of the safety valve, which opening is threaded internally for attachment of the dispensing valve thereto;