i have used a 1930’s N series Ford tractor radiator cap rated for 4 pounds and it fits and works well. $6.50
		 
		
		
		
		
		
		
			
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				44 GPW /                                                                         44 C-15-A Cab 13 Wireless  5 with 2K1  box X 2 /  
44 U.C. No-2 MKII* /  
10 Cwt Cdn  Brantford Coach & Body trailer /                                                       
 94 LSVW / 84 Iltis
			 
		
		
		
		
		
	
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