Trubore Offers the pipes and fittings in two forms particularly – the Rubber Ring and Solvent Joint and therefore are labeled into Variety ‘A’ & Type ‘B’. Form ‘A’ are used for rainwater discharge and ventilation Whilst Kind ‘B’ pipes are useful for strong and waste discharge. ● Professional properties: https://austropipes.com/swr-pipes-and-fittings-manufacturer/