The brass part. I ordered these https://www.amazon.com/gp/aw/d/B07MTHGF7R?psc=1&ref=ppx_pop_mob_b_asin_title

My tube started coming loose about 7 months in.. I bought these from Amazon and now it works perfectly

https://www.amazon.com/gp/product/B07MTHGF7R/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

I also had a very clogged nozzle, but the fitting holding the tube was just bad and broken.