General description JG Lowfit manifold reducer allows any JG Underfloor Manifold port to be converted to a LowFit connection size of 12mm. Simply push the reducer into the JG Speedfit port on both flow and return bars. Technical specifications Connection sizes: 15mm x 12mm Pack quantity: 10 Compatibility and accessories Compatible with JG Speedfit PEX and polybutylene barrier pipe (inserts required) Usage Designed for underfloor heating applications only