✓ In stock This nylon straight union connector joins two 3/16" vacuum lines end-to-end for automotive vacuum system repairs, extensions, and splices. Compatible with windshield wiper vacuum systems, HVAC vacuum actuators, cruise control, and emissions plumbing. The barbed ends provide a secure, leak-resistant connection without clamps on most standard vacuum hose materials. Specifications Type: Straight Union Connector Material: Nylon Hose I.D. (both ends): 3/16" Application: Universal — Automotive Vacuum Systems Vehicle Fitment Universal — Compatible with most domestic and import vehicles using 3/16" vacuum lines Cross-Reference Numbers SMS Part#: 12937 What systems commonly use 3/16" vacuum connectors? 3/16" (approximately 5mm) vacuum line is one of the most common sizes in automotive vacuum systems. It is used in HVAC mode control actuators, windshield wiper vacuum motors, brake booster hoses, cruise control, PCV systems, and emissions-related plumbing on a wide range of domestic and import vehicles. Do I need clamps with these connectors? 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 applications or hose that is cracked or stiff with age, a small hose clamp can be added for additional security. Vacuum lines typically operate at very low pressure, so clamps are rarely necessary. Is there a 1/8" straight connector or a Y-connector available? Yes — South Mountain Supply part 12929 is a straight union connector for 1/8" vacuum lines, with Ford and GM OEM cross-references. Part 12927 is a nylon Y-connector for splitting or joining three 3/16" vacuum lines. Select the connector that matches the inside diameter and configuration of your existing vacuum circuit. How do I repair a broken vacuum line with this connector? Cut the damaged section of vacuum line cleanly with a razor or tubing cutter, removing all cracked or deteriorated material. Push each end of the cut hose onto the barbed ends of the connector until the hose seats past the barb ridge. No adhesive is needed. Verify the repair holds vacuum before returning the vehicle to service. 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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