One single Connector tube with o-ring. Its good to replace your fuel connector tubes each time you change your injectors. Fuel connector tubes catch contamination and failure to replace these may void your injector warranty and cause new injectors to get contaminated. Used connector tubes are also prone to leaking. F00RJ01831 cross references to Cummins 4929864, 2872395. Genuine Bosch product.
Can be used on 5.9L common rail application. I.D. Is larger than F00RJ01572 and should not be mixed.