Hygrade Products Limited 667B Great South Road , Penrose , Auckland 1061 New Zealand About Solutions products Companies Hygrade Products Limited Products Earthenware Earthenware 0 Share Vitrified clay pipes, fittings and accessories for domestic, urban and industrial sewerage systems. Most popular related searches vitrified clay pipe clay pipe clay pipe industry pipe industry pipe system Customer reviews No reviews were found for Earthenware. Be the first to review! Add your review Publish your review Great! review successfully added!