Specifications include, but are not limited to: Rings , lids, and risersmust be cast with a minimum tensile strength of 35,000 psi, in accordance with ASTM Specification A-48-83, Class 35B for Grey Iron. Published dimensions must not deviate by more than +/-1/16” per foot. Published weights must not deviate by more than +/-5%. Casting must be free of defects such as porosity, rough surfaces, blowholes, inclusions and shrinkage. All castings must be cleaned by shot blasting. All round castings of heavy-duty design must be furnished with machined horizontal bearing surfaces. The rings, lids, and risersmust be painted on all surfaces with an asphaltic base paint or approved equal. All risers must be compatible with current Wichita specification rings.