Where can I get gaskets, P/N#35-2204 for Model VAC 820 Foodsaver?

Try this site
https://searchmanuals.net/search7/?keyword=%2Bowners+%2Bmanual&gclid=Cj0KCQiAzePjBRCRARIsAGkrSm4hwGgMJ4loxVKnk_d9loNSyMnzjcinCTYKx6DBNotuk4W7EdNURhoaAggqEALw_wcB

Chances are that you foam gasket are not doing their job anymore. You can make a test by humidifying them with a paper towel. If it's works, you are due to replace them. They will usually last about 2 to 3 years depending on the use.

They are available through ebay or Amazon

eBay or manufacturer

Replacement parts for the Tilia Foodsaver products can normaly be found here:

http://www.foodsaver.com/parts.aspx?search=420

However I am having trouble with your model number. Are you sure it is correct?

Suggest you inquire with the company as to which listed model would be compatible with your model . You may contact them over the web here:

https://secure.foodsaver.com/contactus.aspx

I replace my gasket with a piece of 3/8" Poly Foam Caulk Saver (found mine at Home Depot - @$2.00 for 20'). It's a snug fit in the gasket groove. Cut long enough so that the ends touch tightly. It will create a good air seal and works well.

Replacement parts for your product may be ordered online here:

http://www.foodsaver.com/Category.aspx?id=r


If you are unsure which gasket to order contact FoodSaver via their website:

https://secure.foodsaver.com/ContactUs.aspx

This is likely happening because the unit cannot detect that a vacuum has formed, and the gaskets around the vacuum channel are the probable culprit. The Foodsaver gaskets will deform and/or dry out with time, just like in any device, but you don't necessarily have to replace them. I've tried this inexpensive solution on my own Foodsaver V2490, and it works perfectly.
Buy some food-grade silicone grease and apply it to both the upper and lower gaskets. I remove the gaskets and coat both sides with a thin layer of grease before replacing them in their respective channels. And since this grease will be absorbed and/or dry out with time, you will have to do this occasionally, so I also flip the gaskets (i.e. turn them over) whenever I apply the grease.
You can buy a 2 oz container of silicone grease at any dive store, or you can buy it over the Internet by searching for "Trident silicone grease".
This is a link where you can buy it for around $7.00:
Dolphin Dive Center
I do not work at this dive center, but I am a scuba diver and already had some grease that I use for the numerous rubber gaskets in my gear. The 2 oz. jar will last you several years, and you will find many other uses for it around the house since the grease will last longer than a spray.

This is likely happening because the unit cannot detect that a vacuum has formed, and because of this, the unit will not seal the bags, with the gaskets around the vacuum channel being the probable culprit. The Foodsaver gaskets will deform and/or dry out with time, just like in any device, but you don't necessarily have to replace them. I've tried this inexpensive solution on my own Foodsaver V2490, and it works perfectly.
Buy some food-grade silicone grease and apply it to both the upper and lower gaskets. I remove the gaskets and coat both sides with a thin layer of grease before replacing them in their respective channels. And since this grease will be absorbed and/or dry out with time, you will have to do this occasionally, so I also flip the gaskets (i.e. turn them over) whenever I apply the grease.
You can buy a 2 oz container of silicone grease at any dive store, or you can buy it over the Internet by searching for "Trident silicone grease".
This is a link where you can buy it for around $7.00:
Dolphin Dive Center
I do not work at this dive center, but I am a scuba diver and already had some grease that I use for the numerous rubber gaskets in my gear. The 2 oz. jar will last you several years, and you will find many other uses for it around the house since the grease will last longer than a spray.

the problems with vac is allmost allways the gasket or the tubing in the unit there is a few fittings that get britlle over time and the heat in the unit and the china parts dont help i have got a bunch of these broken units on ebay and fix with drip irr fittings

look the unit manual HERE

FoodSaver Vac 550 Instruction Manual

FoodSaver Vac 1050 Instruction Manual

FoodSaver Professional II Instruction Manual