is there a glass (instead of resin or plastic) alternative to this ?

Not to my knowledge, unless a substitution has been created. The Yosemite coffee pot comes with the plastic version.

does this top fit the farberware 47053 12 cup percolator?

I have the 8 cup percolator #50124 and it worked fine. 50124 https://www.amazon.com/gp/product/B00005NCWQ/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 If you select the 12-cup model on the Amazon page above, for the model I have, it comes up as #47053, but is not listed as a "Yosemite" model, whatever that means. I don't always trust the pictures to be accurate, but they do look the same. Maybe the 12 cup top is larger, but I can't tell. I measured mine (8 cup): the replacement black ring is 2" diameter, the top of the glass part is 1" diameter and rises 7/8" above the ring. If this is the size of your percolator top, it may be a good fit. Otherwise, contact Farberware.

Is the rubber ring made of silicone, and if not, does anyone know of a replacement that uses silicone instead of commercial rubber?

it's neither silicone nor rubber.. it is made of plastic. it does not come in contact with any liquid so you do not have to worry about chemical leaching.

What is the outer diameter of the washer? I see the inner diameter, and the height of the bulb, but not the OD of the washer.

With a standard measuring tape, I measured 6 inches around the outer diameter of the washer.

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Univen Plastic Knob Top and Washer Ring Compatible with Farberware Yosemite Coffee Percolators

Univen Plastic Knob Top and Washer Ring Compatible with Farberware Yosemite Coffee Percolators

Product ID: 299278954

Details

Brand
Univen
Capacity
8 cups
Coffee maker type
Percolator
Colour
Transparent
Special feature
Jug Removable

☕Fits 4-8 cup percolators

🔧Compatible with Farberware models 50124 & 59008

♻️Durable plastic with washer ring included

£29.25

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Description

☕ Elevate your brew game with the perfect knob—because every detail counts!

EFFORTLESS MANUAL CONTROL - Ergonomic knob ensures smooth operation, making every coffee moment satisfying and stylish.
RELIABLE QUALITY BY UNIVEN - Trusted replacement part with a 4.4-star rating from nearly 1,800 users—join the coffee connoisseurs who refuse to compromise.
UPGRADE YOUR COFFEE RITUAL - Restore your classic stove top percolator with a fresh, durable plastic knob and washer ring combo.
MODEL SPECIFIC COMPATIBILITY - Designed exclusively for Farberware models 50124 and 59008—no guesswork, just precision.
PERFECT FIT FOR YOUR FARBERWARE - Seamlessly replaces knob tops on 4 to 8 cup Yosemite percolators for a flawless brew experience.

The Univen Replacement Plastic Knob Top and Washer Ring is a precision-fit accessory for Farberware Yosemite stove top coffee percolators, specifically models 50124 and 59008. Designed for 4 to 8 cup capacities, this durable plastic knob restores manual control and style to your classic coffee maker, ensuring a seamless brewing experience. Not compatible with electric or pre-1997 models, it’s a trusted, highly rated upgrade for home and office coffee lovers.

Specifications

ASIN	B06XC8H5YT
Best Sellers Rank	2,030,815 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 1,019 in Cooktop Parts & Accessories
Brand Name	Univen
Capacity	8 cups
Coffee Input Type	ground
Coffee Maker Type	Percolator
Colour	Transparent
Customer Package Type	Standard Packaging
Customer Reviews	4.4 4.4 out of 5 stars (1,796)
Filter Type	Reusable
Human Interface Input	Buttons
Included Components	Filter
Is the item dishwasher safe?	No
Item Weight	0.02 Kilograms
Manufacture Year	1997
Manufacturer	Univen
Material	Plastic
Model Number	RM50124
Number of Items	1
Operation Mode	Manual
Other Special Features of the Product	Jug, Removable Tank
Part Number	7539772092
Recommended Uses For Product	Home, Office
Style	Classic
UPC	744539860277
Unit Count	1.0 count

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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£29.25

Duties & taxes included

In stock

Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to UK.

Secure transaction

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Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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Received my product in pristine condition. Great service overall.

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