A Series 3500 Banjo BSPP Copper Sealing Washer is a vital component used in conjunction with banjo fittings to ensure a secure, leak-free connection. Typically used with 90-degree banjo adapters, this copper sealing washer is placed between the banjo body (also known as the yolk) and the banjo bolt to create a tight seal. The washer helps to prevent leaks and ensures that the banjo fitting remains sealed under pressure. Banjo fittings are ideal when space is limited, as they save room and weight compared to traditional 90-degree adapters. To complete the connection, both the banjo adapter and banjo bolt, along with this sealing washer, are required.