1/2ips. X 3/8ips. Female Open Cast Iron Hickey

1/2ips. X 3/8ips. Female Open Cast Iron Hickey This is the largest hickey avaiable in Cast Iron. The 1/2ips (1/2NPS) has a 3/4in. I.D. Hole and the 3/8ips(3/8NPS) side has a 5/8in. I.D. Hole Help Please note Lamp thread sizes are NOT the same as their respective diameter. Please review these helpful resources before purchasing your hickeyLamp Thread Size ChartLamp Thread Video