For DAVID BROWN 1290 1294 1390 – Exhaust – 57MM OD. Gwynedd Farm Machinery Part No Q52656 (Please quote when contacting us). DAVID BROWN 1290 1294 1390. All Major Credit /Debit Cards Accepted. Heavier deliveries are dispatched same day if ordered before 12.00 noon. All Items listed in this shop are in stock ready for …