GEM Refrigeration Pty Ltd, Commercial and industrial refrigeration

Technical Services Australia Pty Ltd, Air-conditioning and mechanical services contractor

Blue Ribbon Plumbing Services Pty Ltd, Commercial and domestic plumbing

Chadoak Pty Ltd, Commercial, industrial, and reticulated plumbing

Signal & Hobbs (Gainhill) Pty Ltd, Commercial & industrial roofing and sheet metal products

Tullamarine Plumbing & Drainage Pty Ltd, Commercial, industrial, and reticulated plumbing