Parts › Exhaust Flange Nut for Alloy Barrels 1/4 BSW M20/EX102 Image 1 of 3 Image 2 of 3 Image 3 of 3 Exhaust Flange Nut for Alloy Barrels 1/4 BSW M20/EX102 £3.25 Exhaust flange nut, stainless steel, fitted to Greeves alloy barrels, 1/4 BSW. Greeves part no. M20/EX102, Item 83 in photo Quantity: Add To Cart Added! Exhaust flange nut, stainless steel, fitted to Greeves alloy barrels, 1/4 BSW. Greeves part no. M20/EX102, Item 83 in photo