Agrowtek PBX Sensor Manifold 1" NPT For Hydroponic SensorsA Simple, Clean Manifold For Housing Agrowtek's Hydroponic Sensor Probes These sensor manifolds integrate 2, 3 or 4 water tight gland fittings into a 1" PVC manifold for sensing pH, EC, ORP DO and water temperature inline with a recirculating pump. Compression glands have a rubber insert that clamps around the probes when tightened. Manifolds make it easy to install and remove probes for calibration and maintenance. Recommended for flow rates up to 30