A gas turbine engine component array comprising: first and second components (64;99;164) each having a platform (76;176), the platforms (76;176) being arranged adjacent to one another and provide a gap circumferentially between opposed lateral faces (81; 181) of adjoining platforms (76; 176), the gap extending lengthwise along the opposed lateral faces (81;181); and a seal (77;177;277) arranged circumferentially between the first and second components (64;99;164) and in engagement with the platforms (76;176) to obstruct the gap, a cooling hole being provided in the seal (76;176) and being in fluid communication with the gap, the cooling hole having an increasing taper toward the gap to diffuse the flow of cooling fluid through the cooling hole as it exits the seal (77;177;277) into the gap, wherein the seal (77; 177; 277) extends axially between the opposed lateral faces (81; 181) of the platforms (76; 176) to obstruct the gap in a radial direction, wherein the seal (77;177;277) includes a gas path flow side engaging the platform, and another side arranged radially opposite the gas path flow side and facing a cavity provided between the first and second components (64;99;164), the cooling hole configured to fluidly connect the cavity to the gap; wherein the cooling hole is arranged at an acute angle with respect to the gas path flow side, the cooling hole extending generally in the lengthwise direction of the gap, the cooling hole includes a metering portion having a diameter D, and a diffuser portion, and characterized in that: the diffuser portion has a width arranged in a circumferential direction and a height which corresponds to the diameter D of the metering portion, the width is greater than the height and larger than the width of the gap in the circumferential direction. first and second components (64;99;164) each having a platform (76;176), the platforms (76;176) being arranged adjacent to one another and provide a gap circumferentially between opposed lateral faces (81; 181) of adjoining platforms (76; 176), the gap extending lengthwise along the opposed lateral faces (81;181); and a seal (77;177;277) arranged circumferentially between the first and second components (64;99;164) and in engagement with the platforms (76;176) to obstruct the gap, a cooling hole being provided in the seal (76;176) and being in fluid communication with the gap, the cooling hole having an increasing taper toward the gap to diffuse the flow of cooling fluid through the cooling hole as it exits the seal (77;177;277) into the gap, wherein the seal (77; 177; 277) extends axially between the opposed lateral faces (81; 181) of the platforms (76; 176) to obstruct the gap in a radial direction, wherein the seal (77;177;277) includes a gas path flow side engaging the platform, and another side arranged radially opposite the gas path flow side and facing a cavity provided between the first and second components (64;99;164), the cooling hole configured to fluidly connect the cavity to the gap; wherein the cooling hole is arranged at an acute angle with respect to the gas path flow side, the cooling hole extending generally in the lengthwise direction of the gap, the cooling hole includes a metering portion having a diameter D, and a diffuser portion, and characterized in that: the diffuser portion has a width arranged in a circumferential direction and a height which corresponds to the diameter D of the metering portion, the width is greater than the height and larger than the width of the gap in the circumferential direction.