Click to expand Tap to zoom Diaphragm Block for Hi-Blow HP 80 2pcs by SKS Sold out £64.95 | / 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out Pair of diaphragms mounting blocks for the HP 60/80. Both diaphragms should be replaced at the same time. Click HERE to download maintenance manual.