Steel Cylindrical Pressure Tank with holding Straps....
Made By       The British Safety Stove Co. Birmingham....
Measures        11-1/2" long 7 " dia approx....
Has 3 tapped holes of different sizes one of which is fitted with a Brass wing nut with a Schrader 
 Valve, possibly to pressurise with a foot pump?....
Sorry Thread pitch not known ..............................
UK Shipping weighs 4 Kg without Packaging