Damp-Vent Damp Ventilation Plugs (6-pack)Includes 6 Damp Vent plugs. Proudly South African designed and manufactured. Easy Damp Ventilation Solution For Your Home. When your damp proof course (DPC) is either missing or compromised, you can be sure that damp will slowly cause damage to your walls. Rising damp is an expensive problem to fix. But what if you could stop this problem from spreading ? Prevents further spreading of rising damp Easy installation no need to strip and repaint your