MED Ship's Wheel Approved range of Powder fire extinguishers available in 4kg, 6kg and 9kg sizes. Powder fire extinguishers which come complete with mounting bracket and gauge. 4kg Powder - Rating 21A 113B - Part No: FIR0720 - MED Ship's Wheel Approved 6kg Powder - Rating 27A 144B - Part No: FIR0730 - MED Ship's Wheel Approved 9kg Powder - Rating 43A 233B - Part No: FIR0740 - MED Ship's Wheel Approved