That fits

Description Article no. Article Image  
Male Male DIN 11851 short DN40 1.4404 polished 1101500004030 Male DIN 11851 short DN40 1.4404 polished
Seal Ring Seal Ring DIN 11851 DN40 NBR 1000400004054 Seal Ring DIN 11851 DN40 NBR
Nut Nut DIN 11851 with Undercut DN40 1.4404 polished 1100300004030 Nut DIN 11851 with Undercut DN40 1.4404 polished