Sealing connected fitting

Sleeve Spigot PN in bar Material Article no.
G 1/4 G 3/8 400 brass ZSN 111
G 1/4 G 1/2 brass ZSN 151
G 1/4 G 1/2 CrNi-Steel ZSN 153
G 1/4 G 3/8 stainless steel ZSN 113
G 1/8 G 1/4 brass ZSN 101
G 1/8 G 1/4 NPT brass ZSN 101 NPT