hi-recently renovating a house and im going to renew soil pipe outside(existing one is cast) and the toilet connection is lead,so im going to renew all waste connections, the toilet is to bereplaced and repositioned so im starting from scratch.....i guess you can get solvent weld and pushfit connections-which is the best???also the original waste from the bath and the sink where lead and went into a hopper which came from roof gutteing-would i be best taking these to the new toilet soil pipe via some sort of universal connection. any info appreciated.