Pap-Flon Engineering Co. Pvt. Ltd. Manufactures Equal and Unequal Instrument Tee Joints. Pap-Flon Engineering Co. Pvt. Ltd. Manufactures Lined Carbon Steel and Stainless Steel fabricated Components with fluoro polymer resins. The Equal and Unequal Instrument Tee Joints are available in sizes of 15 NB to 600 NB.