Flange Accessories Dn 100 (4" Pipe Size) Required Accesories Per Connection: Eight Pn:135-930 M16X65 Bolt Kits One Pn:030-304 Dn 100 Seal When A Control Is Used Alone, One Mating Flange Is Needed For Each End, For A Total Of Two Flanges. When One Control Is Bolted To Another, Such As An Frs To A Dmv, One Mating Flange Is Needed For Each End, For A Total Of Two Flanges.