Poros Building Drain; Silt on Poros Slab Below Wall A. Poros Building Drain; With Broken Roof Tile on Poros Slab. Poros Building Drain; On Roof Tile Used for Drain. Poros Building Drain; On Line of Drain ... ΟΟ-17 3246, 3247 ΟΟ 1053 P 19987 ΟΟ 1304 A 1484 ΟΟ 1303 T 2982 ΟΟ 1020 P 19973 ΟΟ 1423 P 20435 ΟΟ 1305 SS 10894 ΟΟ 1315 L 4630 ΟΟ 1314 P 20253 ΟΟ 1316 MC 803 ΟΟ 1317 ST 464 ΟΟ 1318 IL 1068 ΟΟ 1320 BI 644 ... 5th B.C ... ΟΟ-17 ... ΟΟ 1053 ... ΟΟ 1304