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- Compatible with Worcester Greenstar CDi 25 30 35 40 gas boilers; sized for assemblies requiring a 14 x 3.55 mm round section O ring. - replace OEM 87161165490 for like-for-like servicing where a 14 mm inner diameter and 3.55 mm cross section are specified. - NBR nitrile rubber construction resists common fuels, heating oil, water, and glycol for durable sealing performance. - Creates a tight seal in gas and water paths to help reduce seepage during routine maintenance and reassembly. - Suited for boiler repair tasks including sealing couplings, manifolds, and pipe unions; 20-piece pack keeps spares ready for quick swaps.