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Technical Bulletin 2011 Issue 2 - Terrain pipework and fittings
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Technical Bulletin 2014 Issue 3 - Live stack replacement
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Technical Bulletin 2016 Issue 2 - P.A.P.A. and Pleura Valves
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Permavoid Technical Bulletin Issue 2 - Sub-base Replacement
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Permavoid Technical Bulletin Issue 9 - A System for all Applications
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Permavoid Technical Bulletin Issue 7 - Roads and Highways
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Permavoid Technical Bulletin Issue 5 - Passive Capillary Irrigation
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Permavoid Technical Bulletin Issue 3 - Source Control
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Ridgitreat Technical Bulletin Issue 1 - Ridgitreat Surface Water Treatment Pipe
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Permavoid Technical Bulletin Issue 1 - Shallower Installations
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