Compatible with fuel systems, compatible with carburetor, compatible with fluid line seals, compatible with small equipment. These O-rings have an inner diameter of 4mm, a thickness of 2mm, and an outer diameter of 8mm. Made of fluororubber material that offers dependable resistance to fuel, oil and heat. These O-rings offering reliable sealing to maintain pressure and fluid integrity, making them suitable for routine maintenance and component replacement tasks. Product include a total of 50pcs metric o-rings, which can completely meet your daily use needs and replacement., Manufacturer: VGOL