S
Stephen@nic
hi i am gase safe but came across a potterton profile today it has gromits in the bottom were the wires ect come out all these were seald with mastick apart from one which it was spilling from there was also mastick on the bottom of the case seals were it meete the boiler face.i have I D the boilr but can any one tell me if it is normal for mastick to be put in gromits as it scrinks when it is heated over time so could any one help with some advice please