Dorman 47100 — Tee/Y assortment
Sizes: 1/8, 3/16, 1/4 and 5/16 in. White plastic. T- and Y-shaped connectors; compare each port size within the assortment.
Check product and conditionDorman Vacuum Hose Connectors: Straight, Tee & Elbow Guide
When repairing a cracked engine vacuum line or replacing a missing hose junction, a small connector can make the difference between a sealed circuit and a persistent vacuum leak. Dorman sells straight joiners, tees, Y fittings and 90-degree elbows in different nominal hose sizes. Match the number of ports, hose ends and intended vacuum-system material—not just the connector colour.
Identify the connection shape first
Straight joinerConnects two hose ends in line. The 47300, 47303 and 47305 are separate small-diameter sizes.
Dorman vacuum hose connector sizes by MPN
| MPN | Shape | Listed hose sizes | Material |
|---|---|---|---|
| 47100 | Tee/Y assortment | 1/8, 3/16, 1/4 and 5/16 in | White plastic |
| 47101 | Straight assortment | 1/8, 3/16 and 1/4 in | White plastic |
| 47300 | Straight | 1/8 in | White plastic |
| 47303 | Straight | 3/16 in | White plastic |
| 47305 | Straight | 1/4 in | White plastic |
| 47328 | Tee assortment | 3/8 × 1/4, 1/8, 3/16 × 1/8, 3/16 × 1/4, 1/4 × 1/8 in | White plastic |
| 47341 | Three-port tee | 3/8 × 1/4 × 3/8 in | White plastic |
| 47411 | 90° elbow | 9/64 × 5/32 in | Black vinyl |
| 47431 | 90° elbow assortment | 1/8 × 5/32, 1/8 × 1/8, 1/8 × 11/64, 9/64 × 5/32 in | Black vinyl |
Sizes above follow the identified catalog descriptions. For assortment packs, the listed measurements describe included connector families; not every piece necessarily includes every size. Check the individual listing if a particular combination is required.
Do not assume interchangeability: A 1/8-inch straight joiner is not automatically an alternative to a 1/8-inch tee, and a 9/64 × 5/32-inch vinyl elbow does not have two equal-size ends. Confirm the full vacuum-circuit routing and each barb before replacing a fitting.
Selecting a matching vacuum connector
- Identify the hose location: Establish whether the fitting serves a vacuum actuator, sensor, emissions device, intake plumbing or another system.
- Measure the hose: Confirm the specified nominal hose size at every connector port. Mixed-size tees and reducers require different end measurements.
- Match the number of ports: Compare the original straight, tee, Y or elbow design. Do not leave a required vacuum connection unused.
- Check construction: Use a compatible material for the application, temperature, vacuum and chemicals. Black vinyl and rigid white plastic are not assumed equivalent.
- Inspect adjacent hoses: Cracks, loose ends and aged tubing can continue leaking after a new joiner is fitted.
Common questions about these connectors
Are Dorman 47300, 47303 and 47305 the same connector? They share straight white-plastic construction but have different listed hose diameters: 1/8, 3/16 and 1/4 inch respectively.
Can a tee replace a damaged straight fitting? Only if the actual system requires a third branch. Do not add an unnecessary open or capped branch simply to use a different connector.
Is 47431 a single 90-degree elbow? Its catalog description identifies an assortment with several nominal end-size combinations. Use the specific connector needed in the existing circuit.
Compare exact Dorman vacuum fittings
These product cards link to the separate UsedRVParts listings. Check the current condition and contents on the product page; the images are catalog illustrations, not evidence of the condition of any individual item.
Dorman 47101 — Straight assortment
Sizes: 1/8, 3/16 and 1/4 in. White plastic. Straight connectors in several nominal hose sizes.
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Dorman 47300 — Straight
Sizes: 1/8 in. White plastic. One-size straight connector for an appropriate 1/8-inch vacuum line.
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Dorman 47303 — Straight
Sizes: 3/16 in. White plastic. One-size straight connector for an appropriate 3/16-inch vacuum line.
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Dorman 47305 — Straight
Sizes: 1/4 in. White plastic. One-size straight connector for an appropriate 1/4-inch vacuum line.
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Dorman 47328 — Tee assortment
Sizes: 3/8 × 1/4, 1/8, 3/16 × 1/8, 3/16 × 1/4, 1/4 × 1/8 in. White plastic. Mixed-size tee connectors for selected branching hose circuits.
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Dorman 47341 — Three-port tee
Sizes: 3/8 × 1/4 × 3/8 in. White plastic. Three-port T-shaped connector with nominally different branch diameter.
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Dorman 47411 — 90° elbow
Sizes: 9/64 × 5/32 in. Black vinyl. Flexible 90-degree connection with different listed hose sizes on each end.
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Dorman 47431 — 90° elbow assortment
Sizes: 1/8 × 5/32, 1/8 × 1/8, 1/8 × 11/64, 9/64 × 5/32 in. Black vinyl. Multiple flexible elbow profiles and nominal end sizes.
Check product and conditionOther vacuum-system parts
For an unused port that is specified to be closed rather than joined to another hose, see our Dorman vacuum caps and larger bypass plugs guide. Those are closure parts, not inline or branch connectors.
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