### Double O-Ring Silicone + EPDM
Combining two different o-ring types gives us the ability to leverage two different o-ring materials making an overall more reliable sealing fitting.
**Silicone**
* High chemical resistance
* Excellent resilience/rebound rating (especially at cold temperatures)
* High flexibility in both very hot and very cold conditions
* Suitable for high vibration conditions
**EPDM**
* Durability
* Abrasion resistance
* Low gas transmission rate (oxygen, nitrogen, CO2)
### Poketon Body - UV Resistant
* High chemical resistance
* UV resistant for outdoor applications
* High durability and toughness in hot and cold conditions
* Autoclavable / heat resistant
### Tube Depth Gauge
* Ensures tubing is inserted to correct depth
### High Burst Pressure
* All Gen 2 Fittings are made with 20bar (300psi) or greater burst pressures. The smaller 8mm and 6.35mm fittings have even higher burst pressures generally over 400psi.
### Colour Coded Collets
The Gen 2 Fittings have colour coded collets making it easier to visually identify the different sizes.
* **Green**** - 6.35mm (1/4")**
* **Black - 8mm (5/16")**
* **Blue**** - 9.5mm (3/8")**
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**All duotight fittings are ideally suited to EVABarrier**
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