Valleys are one of the most vulnerable parts of the roof. Marley Universal GRP dry valleys provide totally weathertight detailing that are fast and easy to install and compatible with all Marley concrete, clay plain and interlocking tiles. Please note this is compatible with the Marley anglia, double roman, ludlow major, ludlow plus, mendip and wessex tiles. Simple, rapid and fast to install. Dry fix, mortar free system for a long maintenance free life. Can accomodate up to 20 degree pitch variance either side of valley. Can be used on up to 60 degree pitches. Gives a finished appearance of a close cut roof.