Could you please make a price quotation on manure digester double membrane cover (gas membrane) for bio gas fermenter with all system components (air blower pressure valve and others). Requested diameter size is 18 and 20 meters. We are interested in bio gas storage bag for size of not more than 3m in diameter and not longer than 30m length. If rectangle/square type than not more of 3m high, 7 meters of width and 30m length. Desired or preferable minimum volume is 150m3 or more. Could be two or more smaller bags interconnected to achieve greater volume.