Allstar Performance ALL36170 Aluminum 3" Bung and Cap Kit
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They don't have a gasket or an o ring, so I don't believe they are.
I believe the part number is different. The only one with Amazon Prime is the silver cap.
Kit for Bungalows and Caps, No. 1 Weld-in diameter of 375 Kit includes: On, Steel Bung, Silver Anodized Aluminum Threaded Cap
There isn't a break in this one. I used it on an expansion tank I built, with the addition of an overflow hose. Anyone who knows how to weld should be able to do so without difficulty. The product is of excellent quality.
Selected User Reviews For Allstar Performance ALL36170 Aluminum 3" Bung and Cap Kit
These appeal to me. I've already used this product three times and even ground one out of an older fuel cell and reused it without any warping. I don't like how the threads feel rough when turning, but that's due to the threads' size. On them, there are no rough edges or flaws. It's perfect because it has a rubber gasket seal, and the handle is easy to grip and turn.
I used this as a new fill port for my engine, and it worked well, but the cap and flange threads are different sizes, so there is a lot of side to side play when not fully tightened. Cross-threading is a major concern for me.
Filling through the vent hole is 10 times easier. The bung itself is nicely welded and thick enough to avoid warping. This is something I added to a 9" that I narrowed, but it's obviously universal.
I went with the size that was mentioned. It is considerably larger.
It was a cinch to use. I'm going to buy it again for future projects.
Installed on the rear cover of an off-road vehicle. I'm going to order another one for the front differential. It's simple to add oil and inspect gears with this tool.
Excellent product at a reasonable cost.