Service Port Plastic Cap 3/16 SAE (5 pcs. Pack)
Service Port Plastic Cap 3/16 SAE (5 pcs. Pack) — a protective sealing cap for automotive A/C service ports (Schrader valve fittings). Service port caps serve as the primary environmental seal that keeps moisture, dirt, and debris out of the valve core area. Even a small amount of moisture entering through an uncapped service port can contaminate the refrigerant system, form acids, and cause corrosion of internal components including the compressor, TXV, and evaporator.
Specifications
- Precision-threaded cap for secure, leak-free seal
- Includes internal O-ring or gasket for positive sealing
- Resists UV degradation, road salt, and engine bay chemicals
- Color-coded or size-matched for high-side and low-side identification
- Compatible with R134a and R1234yf service port fittings
Why Replace Missing Caps?
Missing or damaged service port caps are one of the most overlooked causes of A/C system contamination. During every A/C service, inspect and replace caps that are cracked, missing their internal seal, or cross-threaded. Proper caps also provide a secondary seal behind the valve core, adding an extra layer of protection against slow refrigerant leaks.
