That fits

Description Article no. Article Image  
Male Male DIN 11851 long DN20 1.4404 polished 1101300002030 Male DIN 11851 long DN20 1.4404 polished
Seal Ring Seal Ring DIN 11851 DN20 NBR 1000400002054 Seal Ring DIN 11851 DN20 NBR
Nut Nut DIN 11851 with Undercut DN20 1.4404 polished 1100300002030 Nut DIN 11851 with Undercut DN20 1.4404 polished