If these tanks are not full then, to stop oxidation, you need to put a 'blanket layer' of CO2 gas over the contents; CO2
is heavier than air. It's not expensive to hire a CO2 cylinder. Speidel 'Oval' complete with NW10 exit tap*, lid and air-lock:- * or a special outlet fitting, in place of the NW10 exit tap, having a 1" bsp female thread, £15.50 Speidel 'Round' complete with NW10 exit tap*, lid and air-lock:-
Winegrowers Supplies
- Polythene tanks and Glass demijohns - carboys

60 litres: 510 mmL x 350 mmW x 520 mmH, £55
100 litres: 610 mmL x 400 mmW x 620 mmH, £79
200 litres: 800 mmL x 490 mmW x 770 mmH, £147
300 litres: 870 mmL x 570 mmW x 870 mmH, £185
500 litres: 1100 mmL x 660 mmW x 1040 mmH, £320
a ball-valve (1" bsp male/male) is then needed, to fit into the thread.

12 litres: 260 mm diameter x 350 mmH, £30
20 litres: 310 mm diameter x 418 mmH, £35
30 litres: 340 mm diameter x 470 mmH, £39
60 litres: 400 mm diameter x 610 mmH, £55
120 litres: 500 mm diameter x 800 mmH, £92
Seals and other parts for these Speidel polytanks:
Large orange lid, for Oval and smaller Round polytanks, £17.00
Large seal for this lid, £3.30
Orange plastic closing cap, £4.50 
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Speidel 'mash fermentation bins':-

600 litre, weighing 50 kilos each, 1.25" bsp stainless steel female thread on outlet, £410
1120 mm diameter, 1190 mm high, with base for moving around with a pallet truck.
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Glass Demijohns - Carboys:-
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standard size neck, in a plastic carrying case:-
10 litres: top diameter 56 mm outside, 42 mm inside, £22.25
25 litres: top diameter 56 mm outside, 42 mm inside, £37.40 |
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or with an 11.5 cm wide neck opening, in a plastic carrying case:-
10 litres: £26.00 - the diameter is about 40 cm and height 39 cm. |
Large cleaning brush for 25 and 34 litre carboys, £16.50
or a huge cleaning brush for 54 litre carboys, £39.50
This is about a metre long. It could also be used for stirring lees in barriques.
Prices shown are exclusive of Vat.
Delivery will need to be charged at cost.