Home default Paying Terms: by irrevocable letter of credit, or TT 30% payment in advance, 70% upon products completion. Paying Terms: by irrevocable letter of credit, or TT 30% payment in advance, 70% upon products completion. Pvc Pipe April 21, 2019 Share: Facebook Twitter Pinterest Paying Terms: by irrevocable letter of credit, or TT 30% payment in advance, 70% upon products completion. ... Click to read moreOthers news: