A gas turbine engine comprising: a compressor ; a combustor fluidly connected to the compressor ; a turbine fluidly connected to the combustor ; at least one instrumentation egress incorporated in a compartment of said compressor , combustor and turbine ; and an instrumentation adaptor incorporated in said at least one instrumentation egress , the instrumentation adaptor comprising: a seat ; characterized in that the instrumentation adapter further comprises a seal contacting a surface of the seat and being constructed of a crushing seal material; a follower contacting said seal opposite said seat ; a compressive component contacting said follower opposite said seal and including an exterior facing interface feature, wherein the compressive component is interfaced with an interior surface feature of the instrumentation egress , the seal is maintained in a compressed state via said compressive component , and a cooling tube is connected to said instrumentation egress , the cooling tube including a lead wire passage passing through the cooling tube for receiving one or more instrumentation lead wires ; and a cooling fluid source, wherein an injection means is configured to inject cooling fluid from the cooling fluid source into an interior of the cooling tube , or passages in a wall of the cooling tube are configured to circulate cooling fluid received from the cooling fluid source. a compressor ; a combustor fluidly connected to the compressor ; a turbine fluidly connected to the combustor ; at least one instrumentation egress incorporated in a compartment of said compressor , combustor and turbine ; and an instrumentation adaptor incorporated in said at least one instrumentation egress , the instrumentation adaptor comprising: a seat ; characterized in that the instrumentation adapter further comprises a seal contacting a surface of the seat and being constructed of a crushing seal material; a follower contacting said seal opposite said seat ; a compressive component contacting said follower opposite said seal and including an exterior facing interface feature, wherein the compressive component is interfaced with an interior surface feature of the instrumentation egress , the seal is maintained in a compressed state via said compressive component , and a cooling tube is connected to said instrumentation egress , the cooling tube including a lead wire passage passing through the cooling tube for receiving one or more instrumentation lead wires ; and a cooling fluid source, wherein an injection means is configured to inject cooling fluid from the cooling fluid source into an interior of the cooling tube , or passages in a wall of the cooling tube are configured to circulate cooling fluid received from the cooling fluid source. a seat ; characterized in that the instrumentation adapter further comprises a seal contacting a surface of the seat and being constructed of a crushing seal material; a follower contacting said seal opposite said seat ; a compressive component contacting said follower opposite said seal and including an exterior facing interface feature, wherein the compressive component is interfaced with an interior surface feature of the instrumentation egress , the seal is maintained in a compressed state via said compressive component , and a cooling tube is connected to said instrumentation egress , the cooling tube including a lead wire passage passing through the cooling tube for receiving one or more instrumentation lead wires ; and a cooling fluid source, wherein an injection means is configured to inject cooling fluid from the cooling fluid source into an interior of the cooling tube , or passages in a wall of the cooling tube are configured to circulate cooling fluid received from the cooling fluid source. <EOS>