Modernise your classic airgun's performance with our premium NBR Rubber Leather Replacement Breech Seal. Specifically engineered as a low-maintenance, high-durability alternative to old-fashioned leather washers, this Nitrile (NBR) rubber seal delivers an immediate, airtight seal between the barrel and breech block. Sized perfectly to act as a drop-in replacement for vintage Lucznik, Haenel, Diana, Winchester, and Beeman models, it permanently solves the low-velocity issues caused by dried-out, cracked, or leaking original leather seals.