O-Ring for TRE alloy V-Band rings 4" / 102mm V-Band O-Ring O-Ring for TRE alloy V-Band rings Original TRE product Perfect for leak free aluminum pipe connections. Can be used on intercooler piping, as well as exhaust connections. Mix and match flanges for stainless to aluminum connections. CNC from 6061 T6 Aluminum, High Temp Silicone O-Ring, Male and Female Interlocking flanges, low profile design for tight spaces, thick recessed welding flanges for increase weld stength, Heavy Duty V band and retainers, 100% 300 series stainless V band clamp. All made in the USA - High-temp silicone o-ring - Made in the USA