Pap-Flon Engineering Co. Pvt. Ltd. Offers Man Hole Cover Spare with Side Glass Charging Nozzle. Pap-Flon Engineering Co. Pvt. Ltd. Manufactures Lined Carbon Steel and Stainless Steel fabricated Components with fluoro polymer resins. The Man Hole Cover Spare with Side Glass Charging Nozzle is available in size of up to 700 NB.