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Tightly lockable shaft for vacuum drainage systems
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Drainage system
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Removal of waste water by suction pipe - which has holes for injection of air to form air bubbles for lifting effect
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Protective container with house connection shut-off valve and control box for a low-pressure waste water system
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Vacuum cleaner
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Underground thawing system for path or garage entrance - uses fluid temporarily heated to initial temp. and pumped in circuit
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