SAMPLING VALVES (33 & 34 Series) - Cipriani Harrison currently manufacture two types of Sampling Valves,; the 33-series which is machine from either 304L or 316L stainless steel, has no seats or seals and works by a simple quarter turn handle that turns a stainless steel plug. The 34-series sample valve is machined from either 304L or 316L stainless steel, is completely self-draining and has PTFE and Silicone seals. The 33- series is available with 3/8” or 1/2” MNPT or 1” Clamp Inlet connections and the 34-series comes in ½” MNPT and