Respirator Pre-filter holder thing what's it called?

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I'm looking for the little plastic things that hold the pre filters for the sperian/honeywell filter cartridges,What are they called? Where can I buy them? I have the cartridges, and the pre filters, but I lost the little plastic holder things

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http://www.philswelding.com
Reply:Probably called prefilter retainers.  I would search your model number on Honeywell's site, find the part number for the retainers and then search the web for a source.  Labsafety, Grainger are big general distributors.  If you can find a local place that carries Honeywell, then you can try through them as they may have a catalog.Aw heck, is this the right one?https://www.grainger.com/product/HON...iner-Cap-3NVL1-DaveXMT304 with: 22A Feeder, or HF251 Hi Freq DC TIG air cooled