The P4-CG from Zurn is a medium-duty cast iron slotted grating that is suitable for a wide range of light vehicle traffic applications and is designed to fit the Zurn Z884 Linear channel drainage system. Grating Specifications : Load Class B Cast Iron Material 0.375" Slot width Large project? Request a Quote P4-CG Grate Specification Sheet Your #1 Trench Drain Supply Resource!