Dammit drainseal mats are treated with a formula which prevents mould growth and anti-freeze properties so the mat remains flexible down to -20c. The most effective low cost drainseal on the market. Used by most fire services as first line pollution defence. This product gives 100% seal even on rough surfaces. Remains flexible down to -20c non toxic and bio inert. Resistant to oil, water and most chemicals. Simple to use – peel off cover and tread onto drain. Place in areas of high risk in the wall mounted box. Also available as a gulley blocker for blocking long gulley drains.