... BOARD-Made in china,drainage sheet,sheet drain HW-PSD20 (106) DRAIN BOARD,drainage sheet,sheet drain The HW-PSD20 Drain ... for details sees (chart garage roof project)Product: HW-PSD20(106)Color of under plate: Black/WhiteMaterial quality: High PolystyreneQuality(g ... .9Flow rate (Loss 10cm) (L/S) : 4.2 HW-PSD20 (106) sheet drain /drainage sheet