This unbreakable polyethylene cone with stainless steel orifice is economically priced, simple to use and cleans easily. The Flow Cone Set is for field measurements of flowability of fluid hydraulic grouts used in preplaced aggregate concrete. The flow cone method is for use with grouts having 35 seconds or less efflux time. Flow Cone - ½” stainless steel discharge orifice with cap. Flow Cone - ½” stainless steel discharge orifice with cap, point gauge level indicator and large steel ring with stand. ASTM C939 . Also available in 3/4" orifice but does not conform to ASTM.