Are these food grade or safe to use in a 5 gallon beer keg?

The manufacturer says they are intended for lubricating oil and are not safe for food. But the main description says they are for plumbing use. Can someone please explain?

Does this work for air sealing? trying to seal an air gap between an air motor and a hopper unit in my airsoft gun.

Certainly worth trying; this is a handy kit I purchased and my husband has dipped in to it on several occasions. These are round, but if it can be compressed enough to seal off your area, and as there are no caustic fluids are involved (ie, like an AC unit with the newer freon), it should be fine. You just have to find the right fit. Hope it works for you.

need to buy 150 1/ 4 id 3/8 od 1/16 thick 0-ring

This is a metric set. You might find something close but not exact n this set. Suggest you look specifically for the O ring size and material makeup that you need.

Material	Nitrile rubber
Nominal Inside Diameter	10 Millimetres
Item Diameter	3 Millimetres
Brand	HongWay
Colour	Black
Nominal Outside Diameter	3 Millimetres
Temperature Range	4E+1 Degrees Fahrenheit
UPC	753393011022
Manufacturer	HongWay
Net Quantity	1 count
Number of Pieces	770
Country of Origin	USA
Model number	HongWay20190820236320
Item Weight	141 g
Item model number	HongWay20190820236320
Are batteries included?	No

770pcs Rubber O Ring Assortment Kits 18 Sizes Sealing Gasket Washers Made of Nitrile Rubber NBR by HongWay for Car Auto Vehicle Repair, Professional Plumbing, Air or Gas Connections

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