That fits

Description Article no. Article Image  
Seal Ring Seal Ring DIN 11851 DN20 NBR 1000400002054 Seal Ring DIN 11851 DN20 NBR
Male Male long DN20 1.4301/1.4307 polished 1201300002010F Male long DN20 1.4301/1.4307 polished
Nut Nut DIN 11851 with Undercut DN20 1.4301/1.4307 polished 1100300002010F Nut DIN 11851 with Undercut DN20 1.4301/1.4307 polished