Reducing ring according to former DIN 46320, with Pg connection thread and Pg internal thread according to DIN 40430. External thread: Pg 21 Internal thread: Pg 11 External thread length: 7 mm Internal thread length: 10 mm Outside Ø: 30 mm with connection thread sealing ring 987/...(please order separately!) : IP68 Material: brass, nickel-plated