The Hamworthy O ring ID53.75 x MAT’L 3.53DIA NITRILE 7 is a vital component for residential boilers, designed to ensure a secure seal and prevent leakage. Made by the trusted brand Hamworthy, this O ring is a reliable and essential part of maintaining the efficiency and safety of heating systems. With a durable construction and precise measurements, this product is a key element in ensuring the smooth operation of residential boilers. Brand new in packaging.