procurement of fire hydrant landing valve ( isi mark ) for firefighting system installed at stpp dongalia. procurement of fire hydrant landing valve ( isi mark ) for firefighting system installed at stpp dongalia. , fire hydrant landing valve oblique type completely made of stainless steel ( nonmagnetic quality ) bearing isi mark & is 5290, heavy duty hand wheel made of c.i. with 4 ribs, pvc blank cap with g.i. chain, 63 mm dia female coupling ( s.s. nonmagnetic quality ) inside rubber o ring and assorted one lug welded with coupling, flange dia 190 mm with 4 diagonal holes of 20 mm dia, bottom side of spindle shall have hole with lock pin below valve rubber seat, full size washer and nut.