A multi-way tubular connector block comprising: - a body having a primary tubular channel of a first diameter and at least two openings or ports (13, 30) in communication with the primary tubular channel; - one or more resiliently deformable plug portions having secondary tubular channels of a secondary diameter there through, wherein the secondary diameters of the secondary tubular channels are sized and dimensioned to permit snug fitting of a shock tube therein so thata plurality of shock tubes can be secured in the plug portions so that the open ends of the shock tubes are in communication with the primary tubular channel; - a securing mechanism for securing the plug portions to the body, wherein the securing mechanism for securing the resiliently deformable plug portion being provided on at least one of the ports (13, 30), and wherein the securing mechanism is in the form of an aluminium, or other metal tube which protrudes and is secured into the body and, in use, when a plug portion is inserted into the securing mechanism, a portion of the metal tube which extends from out of the body is crimped onto the plug portion thereby securing the plug portion in position; and - attachment means provided at one or more of the ports (13, 30), wherein the attachment means is a screw threaded or bayonet type formation configured to receive and attach a complementary formation of an igniter body, or a delayed ignitor, being a source of the ignition in communication with the primary tubular channel so that a signal propagating through said primary tubular channel initiates shock tube by means of said igniter or delayed igniter and wherein the attachment means is further configured to receive and attach a complementary formation of a hub or central chamber shaped and dimensioned to promote propagation of the signal, wherein the hub or central chamber is configured for bringing several tubular connector blocks in communication with each other. - a body having a primary tubular channel of a first diameter and at least two openings or ports (13, 30) in communication with the primary tubular channel; - one or more resiliently deformable plug portions having secondary tubular channels of a secondary diameter there through, wherein the secondary diameters of the secondary tubular channels are sized and dimensioned to permit snug fitting of a shock tube therein so thata plurality of shock tubes can be secured in the plug portions so that the open ends of the shock tubes are in communication with the primary tubular channel; - a securing mechanism for securing the plug portions to the body, wherein the securing mechanism for securing the resiliently deformable plug portion being provided on at least one of the ports (13, 30), and wherein the securing mechanism is in the form of an aluminium, or other metal tube which protrudes and is secured into the body and, in use, when a plug portion is inserted into the securing mechanism, a portion of the metal tube which extends from out of the body is crimped onto the plug portion thereby securing the plug portion in position; and - attachment means provided at one or more of the ports (13, 30), wherein the attachment means is a screw threaded or bayonet type formation configured to receive and attach a complementary formation of an igniter body, or a delayed ignitor, being a source of the ignition in communication with the primary tubular channel so that a signal propagating through said primary tubular channel initiates shock tube by means of said igniter or delayed igniter and wherein the attachment means is further configured to receive and attach a complementary formation of a hub or central chamber shaped and dimensioned to promote propagation of the signal, wherein the hub or central chamber is configured for bringing several tubular connector blocks in communication with each other.