Avon Rubber, which makes tubing for the dairy industry and gas masks for the military, has seen off the challenge to one of its contract wins by a disgruntled losing bidder.The company is now able to proceed with the delivery of orders under a five year $176m contract for the M61 filter won in December 2011.The firm was unable to make the delivery of the initial order worth $2.5m after a contractual protest to the US Department of Defense was launched by one of the losing bidders. This protest has now been withdrawn and the firm is able to proceed with the execution of delivery orders under that contract. The share price rose 3.96% to 315.00p by 13:35.NR