That fits

Description Article no. Article Image  
Seal Ring Seal Ring DIN 11851 DN40 NBR 1000400004054 Seal Ring DIN 11851 DN40 NBR
Male Male long DN40 1.4404 polished 1201300004030F Male long DN40 1.4404 polished
Nut Nut DIN 11851 with Undercut DN40 1.4404 polished 1100300004030F Nut DIN 11851 with Undercut DN40 1.4404 polished