AGS 677 - No 2 Drain Cock, plated brass AGS 677 - No 2 Drain Cock, plated brass
This is for a flexible outlet pipe size of about 5/8" bore (for small oil tanks, perhaps). The thread is 1/2" BSP, and there is a safety pin to hold it shut. This became obsolete in the early ‘30’s so to find unused is a great rarity. Very few left now.