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Bulkhead Hose Adapter Quad HVAC 2x 5/8" -6 -10
Bulkhead Hose Adapter Quad HVAC 2x 5/8" -6 -10
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HVAC Billet Bulkhead Hose Adapter Inline Kit (2x 5/8", -6, -10 AC)
Our high-quality modular bulkhead system offer the perfect solution to transfer fluids through your firewall or bulkhead and are o-ringed to ensure a fully waterproof fit. There are many options available including a number of different bulkhead plates and fittings for Air Conditioning, Push-On Hoses, and AN adapters for Water, Fuel, Oil and Power Steering lines. All options can be configured separately to create all sorts of unique combinations!
The lock plates are designed with a hexagonal cut out that interlocks with the bulkhead plates preventing them from‚rotating when tightening the nut on the reverse side. These units are fully sealed with O-rings front and back to ensure a watertight seal, no sealant or gaskets required. On the reverse side is a load spreader plate to ensure that the bulkhead O-ring has consistent pressure applied allowing fitment on thin bulkhead panels that may not have enough strength to offer a consistent seal all around. All edges are chamfered and the back plate is rumbled to help prevent edges damaging or cracking paint.
Specification | Imperial & Other | Metric |
Plate Width | 6.61" | 168 mm |
Plate Height | 1.65" | 42 mm |
Hole Centres | 1.65" | 42 mm |
Max Panel Thickness | 0.55" | 14 mm |
Hole Size Req'd | Ø 0.9" | Ø 23 mm |
Hose Adapter | Ø 5/8" | Ø 16 mm |
-6 AC Adapter | 5/8"-18 O-Ring Male | |
-10 AC Adapter | 7/8"-14 O-Ring Male | |
Refrigerant Compatibility | All Refrigerants | |
Material | 6061-T6 Aluminium | |
Finish | RAW | |
Manufacturer | T7Design Ltd | |
Kit Part Number | 91F-BE9-FF9 |

Balloon Number | Item |
1 | Bulkhead Fittings |
2 | Bulkhead Fitting O-Rings |
3 | Billet Lock Plate |
4 | Bulkhead Plate O-Ring |
5 | Bulkhead / Firewall |
6 | Aluminium Backing Plate |
7 | Aluminium Locknuts |
Notes: The backing plate (No.6) is a load spreader to fully sandwich the bulkhead plate o-ring against the bulkhead/firewall which will ensure a fully watertight seal. This allows installation against thin or flimsy bulkheads that may not otherwise have enough strength to ensure consistent pressure is applied.
Item no.1, 3 & 6 in the diagram are representative and many different options of hose fitting & lock plates are available.

- Please double check that you are ordering the correct diameter for your application.
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