An electrical isolator comprising: a first fluid-carrying member and a second fluid-carrying member spaced apart from said first fluid-carrying member; a resistive, semi-conductive or non-conductive component located between and sealed against said first and second fluid-carrying member (12, 14), wherein said resistive, semi-conductive or non-conductive component is adapted to convey fluid flowing from said first fluid-carrying member to said second fluid-carrying member; a reinforcing composite encircling said first fluid-carrying member, said second fluid-carrying member and said resistive, semi-conductive or non-conductive component, wherein said reinforcing composite is continuous and provides a conductive path between said first fluid-carrying member and said second fluid-carrying member; characterised in that: said reinforcing composite comprises a fibre and a resin mixture, and said resin mixture comprises resin and a conductive additive; said first fluid-carrying member terminates in a first shoulder portion that abuts a first end of said resistive, semi-conductive or non-conductive component, and said second fluid-carrying member terminates in a second shoulder portion that abuts a second end of said resistive, semi-conductive or non-conductive component; said first and second shoulder portions taper from a relatively small thickness and/or outer diameter to a relatively large thickness and/or outer diameter when moving towards said resistive, semi-conductive or non-conductive component; and said reinforcing composite extends axially past each of said tapered portions of said first and second shoulder portions when moving in a direction away from the resistive, semi-conductive or non-conductive component. a first fluid-carrying member and a second fluid-carrying member spaced apart from said first fluid-carrying member; a resistive, semi-conductive or non-conductive component located between and sealed against said first and second fluid-carrying member (12, 14), wherein said resistive, semi-conductive or non-conductive component is adapted to convey fluid flowing from said first fluid-carrying member to said second fluid-carrying member; a reinforcing composite encircling said first fluid-carrying member, said second fluid-carrying member and said resistive, semi-conductive or non-conductive component, wherein said reinforcing composite is continuous and provides a conductive path between said first fluid-carrying member and said second fluid-carrying member; characterised in that: said reinforcing composite comprises a fibre and a resin mixture, and said resin mixture comprises resin and a conductive additive; said first fluid-carrying member terminates in a first shoulder portion that abuts a first end of said resistive, semi-conductive or non-conductive component, and said second fluid-carrying member terminates in a second shoulder portion that abuts a second end of said resistive, semi-conductive or non-conductive component; said first and second shoulder portions taper from a relatively small thickness and/or outer diameter to a relatively large thickness and/or outer diameter when moving towards said resistive, semi-conductive or non-conductive component; and said reinforcing composite extends axially past each of said tapered portions of said first and second shoulder portions when moving in a direction away from the resistive, semi-conductive or non-conductive component. said reinforcing composite comprises a fibre and a resin mixture, and said resin mixture comprises resin and a conductive additive; said first fluid-carrying member terminates in a first shoulder portion that abuts a first end of said resistive, semi-conductive or non-conductive component, and said second fluid-carrying member terminates in a second shoulder portion that abuts a second end of said resistive, semi-conductive or non-conductive component; said first and second shoulder portions taper from a relatively small thickness and/or outer diameter to a relatively large thickness and/or outer diameter when moving towards said resistive, semi-conductive or non-conductive component; and said reinforcing composite extends axially past each of said tapered portions of said first and second shoulder portions when moving in a direction away from the resistive, semi-conductive or non-conductive component.