90-97 Mazda Miata 13 psi Radiator Cap - Gates 31533

Ensure your Miata’s cooling system maintains optimal pressure and safety with the Gates 31533 Radiator Cap, engineered for 1990–1997 Mazda MX-5 Miata (NA & NB). Designed to hold 13 psi of pressure, this Safety Release radiator cap helps raise the boiling point of coolant, enabling better thermal performance whether you’re cruising or spicing things up at the track.

Built with corrosion-resistant heavy-gauge metal, this OE exact replacement guarantees durability and accurate pressure control, even under repeated exposure to heat and moisture. Whether your Miata has a coolant recovery system or not, this cap fits both and delivers reliable seal and release functionality.

The safety release lever integrated into the design helps protect you from steam or hot coolant spray when releasing pressure—critical during high-heat scenarios like track sessions. With a shell diameter of approximately 1.8 inches and a neck depth of around 0.63 inches, it fits tightly on OE radiator necks for a secure seal.

Choosing the right radiator cap, like this 13 psi Gates model, is essential to maintaining consistent coolant temperature and preserving engine performance, especially under racing or spirited driving. A worn or under-sized cap can reduce cooling efficiency and cause overheating, which may lead to head gasket failure—an expensive mistake.

For Miata owners who push their cars to the limit, adding the Gates 31533 Radiator Cap is a small but critical upgrade to protect your engine and enhance cooling system reliability.

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