VRB-13: Base weld on sensor with tapped holes (imperial).
VRB-13M: Base weld on sensor with tapped holes (metric).
VRB-13-1: Base weld on sensor with through holes for VOH200-5 probe (imperial) holder.
VRB-13-1M: Base weld on sensor with through holes for VOH200-5M (metric) probe holder.
VRB-13S: Base weld on senor 316 Stainless Steel (imperial).
VRB-13SM: Base weld on senor 316 Stainless Steel (metric).