Quick Drain USA. The ProLine stainless steel linear trench drain comes with a pre-pitched, one-way polypropylene honeycomb panel that is ready for mortar and tiling. The one-slope pitch achieves proper ADA-compliant shower drainage and features an internally sloped trough that prevents standing water. The thin slot drain allows for uninterrupted porcelain, glass, stone, and tile mosaic surfaces and can be placed anywhere in a shower or wet room layout. Ten sizes are available, and the drain comes in adjustable heights to match a variety of flooring options. 866.998.6685. www.quickdrainusa.com..