Zinc-plated.
Seal of transitional journal (external thread) in acc. with DIN 3852 Form A with sealing ring in acc. with DIN 7603 Form A. Seal: at end of hose or pipe connection with 60° sealing cone in acc. with ISO 8434-6.
Warning: Do not use Teflon tape! Copper seal 1/8 order no. 69815 Copper seal 1/4 order no. 69823