20mm 25mm  Hot Dip Steel Expansion Coupler Sockets Electro Galvanized Available BS4568 BS31 GI Conduit

General:

1) BS4568 BS31 expansion coupler/normal coupler is the expansion type coupler for gi conduit pipe

2)   That is bond the threaded side to none-thread conduit pipe to save the gi conduit pipe meter even cutted

3)   Hot dip galvanized thickness exceeding 50 micrometer,electro galvanized guarantee 12 micro meter to be durable when fixed