Hose Set, Air Injection Rail, Set of 3 Hoses At The Rear of Injection Rail. FITS 1976-1992 V12 XJS. Set of 3 Hoses, Qty 2 of EBC1488 (See #10 In Illustration) & Qty 1 OFC35099 (See #11 In Illustration). The Check Valve (EBC10196, NOT Included) Is At The Rear of The V12 Engine, Between The Two Air Injection Rails (EBC1488)