Radon Top Hats are designed to provide a highly effective seal around service pipes in a gas membrane system. Where service pipework needs to penetrate a gas barrier membrane, you need to use these pre-formed Radon Top Hats to create a gas-tight seal. 
SIGMA GPS Top Hats have been manufactured from polymers that protect properties and occupants from harmful ground gases like radon. 
 
Each Top Hat comes supplied with 1x Jubilee Clip per unit.
 
**Brought in specially for order**
 
**None Returnable/Refundable once in Transit**
 
**Pallet/Delivery Charges will be calculated at checkout depending on quantity and area**
 
**Isle of Wight and Scotland areas must be quoted - Email sales@straight2site.co.uk**