Raw material: base-polymer concrete 

Gap grating-galvanized steel or stainless steel

Parts: polymer concrete base,sump, access hole

Internal width: 100mm, or 150mm  

Gap Grating: with middle gap or with side gap

Internal size of the gap: 15mm

Gap height: with middle gap- 75mm, 100mm, 150mm 

With side gap- 100mm, 150mm