The X7 1/2" Air Vent Radiator Bleed Valve & Blanking Plug & X2 Radiator Bleed Key set is designed for horizontal panel heating systems. Made of steel in a grey colour, this bleed valve and blanking plug set is suitable for both horizontal and vertical radiator orientations. With an Energy Efficiency Ratio (EER) of 3 or less and a Seasonal Energy Efficiency Ratio (SEER) rating of 9, this product helps improve the efficiency of your central heating radiator system. Ideal for DIY enthusiasts looking to maintain and update their heating system.