21000-00-00-00-41-04-02 Bently Nevada Proximity Probe Housing Assembly Engineered strictly to API 670 standards, the aluminum Bently Nevada 21000-00-00-00-41-04-02 Proximity Probe Housing Assembly features an externally accessible, explosion-proof design. This specialized blank-probe configuration allows field engineers to supply their own internal reverse-mount proximity probe, providing ultimate purchasing flexibility while eliminating costly plant shutdowns during future