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Back order – expected to dispatch by Wed 18 Nov (usually 10–15 working days)
Mastercool 91339 is a 270-piece HNBR O-ring assortment for automotive R12 and R134a A/C service.
- Total pieces: 270
- Sizes: 18 different O-ring sizes
- Material: HNBR (hydrogenated nitrile butadiene rubber)
- Applications: Automotive R12 and R134a air-conditioning systems
- Storage: Transparent organiser case with 18 compartments
HNBR provides good resistance to refrigerant, oil, heat, water, gas, alcohol solvents and pressure, making the assortment suitable for routine A/C sealing repairs.