2pcs 3/8 Inch (5/8"-18UNF) Female Flare x 1/2 Inch（3/4"-16UNF）Male Flare Brass Adapter for fuel, oil, air, liquid petroleum (LP) and natural gas lines connections

Flare fittings are named twice over, and that is where orders go wrong. A fitting called 3/8 inch is not 3/8 of an inch across anything you can measure on it — the number refers to the tube it was designed around, while the thread is a different figure altogether. This brass adapter joins two of those sizes, and the supplier publishes both numbers for each end.

Two sizes, each named two ways

One end is 3/8 inch female flare, given in the product title as 5/8"-18UNF. The other is 1/2 inch male flare, given as 3/4"-16UNF. Take the thread figures as the ones to match on, because they are what a thread gauge will actually confirm. Worth knowing before you order: the supplier does not publish a flare angle anywhere in its data. Flare fittings come in more than one angle and they do not interchange, so identify the angle of the fitting you are joining to rather than assuming this one matches it.

Brass, and the range published for it

The body is described as heavy-duty brass, credited with corrosion resistance, ductility at high temperature and low permeability. That last property is the one that earns brass its place on gas and fuel work: a low-permeability metal does not let vapour creep through the wall of the fitting over time the way some plastics do. The published temperature range is -53°C to 121°C, which the supplier also prints as -65 to 250 degrees Fahrenheit. Both are reproduced as given. No pressure figure of any kind is published, which is a significant omission on a fitting offered for gas and fuel duty.

Male to female, which is why it comes apart

The supplier's stated advantage over a plain coupling is that a female flare by male flare arrangement can be broken and remade without disturbing the rest of the run. On a caravan gas line or an oil feed that has to come apart for service, that is a real convenience: one nut backs off and the joint separates, instead of the whole assembly having to be unwound from one end. Named pipe materials are aluminium, steel pipe, copper, brass and plastic.

Key features

• Pair supplied: 2 PCS in the pack, plus 1 PC of Teflon tape.
• Thread figures published: 5/8"-18UNF on the female end, 3/4"-16UNF on the male end.
• Heavy-duty brass: chosen for corrosion resistance and low permeability.
• Breakable joint: separates at the nut without unwinding the whole run.
• Wide temperature band: -53°C to 121°C as published by the supplier.

Specifications

• Female end: 3/8 inch flare, 5/8"-18UNF per the product title
• Male end: 1/2 inch flare, 3/4"-16UNF per the product title
• Material: heavy-duty brass
• Temperature range: -53°C to 121°C, printed by the supplier alongside -65 to 250 degrees Fahrenheit
• Pipe materials named: aluminium, steel pipe, copper, brass, plastic pipe
• Lines named by the supplier: fuel, oil, air, liquid petroleum (LP) and natural gas
• Pressure rating: not published
• Flare angle: not published
• Pack: 2 PCS plus 1 PC Teflon tape

What's in the box

• 2 x 3/8 inch female flare to 1/2 inch male flare brass adapter
• 1 x roll of Teflon tape

Before you fit these

• The supplier names liquid petroleum (LP) and natural gas among the lines this adapter is for. In Australia, work on gas installations is licensed work. A licensed gas fitter must carry out and test any connection carrying LPG or natural gas, and that applies to caravans, campers and fixed appliances alike. Nothing in this listing is an instruction to do that work yourself.
• No pressure rating appears anywhere in the supplier's data. On a fitting offered for gas, fuel and air, that is a serious gap. No number is published that could be compared with your own system pressure. Ask the supplier before relying on it.
• No flare angle is published either. Flare fittings of different angles will thread together and will not seal. Identify the angle of the mating fitting before ordering.
• The temperature figures above are the supplier's own, printed with no standard and no test method attached, and copied across without conversion.
• Fuel and oil lines hold pressure with the engine off. Bleed the pressure off, contain any spill, keep flame and sparks at a distance, and have the finished joint leak-tested before anything goes back into service.

A brass flare adapter with both thread figures published — and the pressure rating and flare angle for the supplier to supply.

Returns, Refunds, and Replacements

Products that are received faulty, damaged, or not as described are eligible for a return, refund, or replacement in accordance with the Australian Consumer Law (ACL). We are committed to ensuring all products meet the standards of quality and reliability expected by our customers. However, please note that we do not accept returns or provide refunds for change of mind. We encourage you to carefully consider your purchase to ensure it meets your needs and expectations.

Delivery Timeframe

Please note that we cannot guarantee the exact date of arrival, and the delivery timeframes (excluding weekends and public holidays) are as follows:

For customers in Victoria, approximately 7-10 working days;
For customers in NSW, SA, ACT, and QLD, approximately 9-12 working days;
For customers in WA, NT, and TAS, approximately 9-12 working days.