How it connects
Trim the tapered jacket to fit the bundle, fit draft stopping snugly around the lines, and tighten hose clamps. The flexible jacket and draft stopping close gaps against weather and pests; roof flashing seals the base.
Male and female halves
“Female” is a descriptive receiving-opening label, not a manufacturer-defined connector gender. The jacket surrounds the bundle; there is no dedicated matching male plug or standardized mating half.
Usually connects to
- Soft/malleable copper refrigerant line sets, including insulation
- Control wires routed with the line-set bundle
Common sizes
- Model-specific jackets for nominal 4-in. and 6-in. roof terminations. RJ4 literature describes a 2.5–4.5-in. trimmed outlet range (63.5–114.3 mm). Do not infer bundle opening from nominal roof-termination size.
Where it is used
HVAC and refrigeration line-set roof penetrationsFlat-roof utility penetrations
Variations
- RJ4-UTILITY flexible line set jacket
- RJ6-UTILITY flexible utility jacket
How to recognise it
Look for a tapered, stepped flexible jacket on a roof gooseneck outlet, stainless hose clamps and separate nested draft-stopping inserts. Confirm model and cut range in its documentation; the stepped rings are trim guides, not threads.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Pressure-pipe socket or compression fitting | This surrounds a continuous bundle passing through the roof; it does not join fluid-carrying pipe ends. |
| Roof flashing boot | This jacket seals the bundle at the gooseneck outlet. The roof membrane flashing around the base is a separate interface. |
Also called
Removable flexible line set jacketFlexible utility jacketCut-to-size line-set penetration boot
Good to know
RoofGooseJack is a product-specific seal. RJ6 size claims conflict: reseller text gives the RJ4 2.5–4.5-in. range, while another description gives 4–6.75 in. Confirm the RJ6 range. Material-test standards do not define mating geometry.
Related connections
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