This is the 13347th most frequent Russian word.
мясного
"Мясного" means "meat" or "meat-related" in English.
In this sentence, "мясного" is used as an adjective in the form of a noun to denote 'something related to meat'.
Я купил немного мясного для ужина.
I bought some meat for dinner.
Here, "мясного" modifies "производителя" to relate it to meat, indicating the type of producer.
Она предпочитает мясного производителя для своих покупок.
She prefers a meat producer for her purchases.
In this case, "мясного" serves to describe "уплотнителя," specifying its association with meat storage or processing.