MSHA APPROVED HEAVY DUTY DISCHARGE & DRIP IRRIGATION LAYFLAT PonaFlat 50 MSHA layflat is a MSHA (Mine Safety & Health Administration) certified hose built with premium raw materials to endure harsh conditions. PonaFlat 50 MSHA is suitable for drip irrigation, mining, & general water transfer applications. APPLICATIONS: Drip Irrigation & Pumping Scenarios, Submain & Relay Supply Lines, High Pressure Sprinkling & Dewatering, Mining, Construction, Quarries