✓ In stock This nylon Y-connector splits or joins three 3/16" vacuum lines in a tee configuration, allowing a single vacuum source to feed two components simultaneously or enabling a splice point in an existing vacuum circuit. Used in windshield wiper systems, HVAC vacuum controls, cruise control, and emissions plumbing across a wide range of domestic vehicles. Cross-references Ford OEM 383031. Specifications Type: Y Connector (Three-Way Tee) Material: Nylon Hose I.D. (all three ports): 3/16" Application: Universal — Automotive Vacuum Systems Vehicle Fitment Ford (Multiple Models) Universal — Compatible with most domestic and import vehicles using 3/16" vacuum lines Cross-Reference Numbers Ford OEM: 383031 SMS Part#: 12927 When would I use a Y connector instead of a straight connector? Use a Y connector when you need to split one vacuum source to feed two separate components, or when you need to add a tap point to an existing vacuum line. Use a straight union (such as 12937 or 12929) when you are simply joining two sections of the same hose end-to-end. Y connectors are common in HVAC systems where one vacuum source actuates multiple mode doors. Do I need clamps with this connector? In most cases, no clamps are required. The barbed ends grip the inside of the vacuum hose to create a secure, low-pressure seal. For higher-demand or aged hose applications, small hose clamps can be added to each port for additional security. Are straight union connectors available in this size? Yes — South Mountain Supply part 12937 is a 3/16" straight union connector, and part 12929 is a 1/8" straight union connector with Ford and GM OEM cross-references. Use this Y connector (12927) when you need to branch or combine vacuum lines; use the straight connectors when joining two hose sections end-to-end. How do I install this Y connector? Cut the vacuum hose(s) cleanly at the desired splice or branch point. Push each hose end onto a barbed port of the Y connector until it seats past the barb ridge. No adhesive or clamps are required for standard vacuum line pressure. Arrange the connected hoses to avoid sharp bends and confirm the circuit holds vacuum before closing up the vehicle. Are these connectors resistant to heat and automotive fluids? Yes. The nylon material is resistant to the temperature ranges and fluid exposure typical of underhood automotive vacuum plumbing, including engine heat, oil vapor, coolant splash, and common cleaning products found in the engine compartment environment.
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