twinwall pipes
BENDS, COUPLERS, Y's, T'S, & REDUCERS AVAILABLE FROM STOCK 
TWINWALL PIPES 
These versatile land drainage pipes are available ex stock from our branch at Willand in Devon and to order from our Avonmouth (Bristol) branch. 
Stock diameters: 
100mm 
150mm 
225mm 
300mm 
450mm 
600mm 
Standard length 
6.0M 
Types available 
Perforated 
Semi perforated 
Fully Perforated NB Not all diameters available in semi & fully perf 
OTHER SIZES AVAILABLE TO ORDER 
- up to 3000mm diameter ! 
twinwall
Twinwall pipes are made from recycled plastic and are a strong but lightweight option for storm and surface water drainage. With an outer ribbed profile and a smooth inner bore they provide a cost effective alternative to concrete land drain pipes. 
UNPERFORATED TWINWALL PIPES are normally used as carrier drains. 
JOINING TWINWALL PIPES: Unperforated pipes are normally joining using a coupler and two sealing rings. The sealing rings fit in the grooves of the outer ribbing of the pipe, and the couplers push over them forming a watertight seal. For semi perforated pipes seals are not normally used, though this may vary depending on the application.  
SEMI PERFORATED TWINWALL has perforations round half the pipe diameter. The perforations are laid upwards for collecting (eg in land drainage) and downwards for dispersal (eg for soakaways) 
FULLY PERFORATED TWINWALL has perforations right round the pipe diameter.