Supplying and laying D.i. specials/fittings as per iS:9523-2000 (iSi marked with the prior approval of Engineer-in-Charge), class K-12 suitable for tyton joint with external bitumen coating and inside cement mortar lining, scaffolding, tools and plants, ropes, guys, etc. Complete in all respects. D.i. specials above 300mm i/d