Hi,sir,

we are a professional manhole cover supplier with 14 years exporting experience.
our standard is EN124. 
material :  ductile iron   and  plastic (  smc.  bmc)

we can design plastic gully/grating  with  D400.  with  competitive price.

Our gully was installed on the longest bridge on the world -- hangzhou bay bridge !!!

if u interesting high quality cover and gully,  pls contact me .

best regards

peter
asian casting china co., ltd