Pap-Flon Engineering Co. Pvt. Ltd. Offers Loose Flange End Pipes. Pap-Flon Engineering Co. Pvt. Ltd. Manufactures Lined Carbon Steel and Stainless Steel fabricated Components with fluoro polymer resins. The Loose Flange End Pipes are available if sizes of 15 NB to 300 NB in 6 Mtrs single length.