6-1/4"
A. P. Services 1000013235 O-Ring (Pack of 6)
You will find the T199362ACC model easy to repurpose for other tasks.
DAP 92-520-3141 Handle For Airtester Tool
What stands out to me is how the amber finish resists fading over long periods.
Busch 127337 Filter 22-0336
What makes this different is that it is both UV resistant and waterproof right out of the box.
Falk 0777237 Steelflex Seal Kit 1100T10
The AQBB brand feels like it was built by people who use this stuff daily.