Expecting to get reliable oxygen clean air out of a single compressor filter is a risky business - there is often ie. In the P21 filters common on Bauer Junior compressors only an O ring or two separating oily condensate from the clean end of the filter, and getting a drop on the tip of the filter could easily happen during installation. Plus any malfunction of the filter cartridge or just simple overrunning will result in unclean air getting through, which could really spoil your day if you're topping off a tank of pure oxygen (or you just put in a nice new squeaky clean system). The answer is a second filter - and this personal filter is a much cheaper way of doing it.Than setting up a whole new filter tower. You could also use it if the air you get is not always to your liking, or to make sure your remote dive holiday isn't spoiled by bad air. This filter has been stripped and oxygen cleaned, all the O rings are Viton (yeah yeah, it shouldn't ever see oxygen so it doesn't actually matter) and it is pre-packed and ready to go with the right combination of molecular sieve and carbon - also dust cap and plug. Most other filters available are NOT guaranteed oxygen clean and are only packed with carbon. This is likely to make the filtration much less effective and oil vapour and odours could still get through - pretty easy to see if it doesn't duplicate the media in your main filter it's not an effective backup.
Felt pads and full repack kits (including media and 1 felt pad) are available. An optional non-return valve will soon be available in a retrofit kit to help prevent backflow of oxygen through the filter, in the event a primed tank is accidentally opened while the pressure in the filter is low. This item is in the category "Sporting Goods\Scuba & Snorkelling\Tanks". The seller is "tfmengineeringaust" and is located in this country: AU. This item can be shipped worldwide.