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 (A) 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 (A). 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 (A) 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 (A). <EOS>