Flange Accessories Dn 125 (5" Pipe Size) Required Accesories Per Connection: Eight Pn:148-830 M16X75 Bolt Kits One Pn:030-312 Dn 125 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.