HAN-HMFA1520
$3.55 NZD
All prices include GST
Big Water Tanks is an official stockist of Hansen Products — New Zealand-made True Fit threaded fittings for plumbing, irrigation, rainwater, farm and marine water systems. The Hansen Male Female Adapter (HMFA1520) is a reducing joiner with a 3/4" (20mm) BSPT female thread at one end and a 1/2" (15mm) BSPT male thread at the other.
The Hansen HMFA1520 steps a 3/4" (20mm) thread down to 1/2" (15mm). Its 3/4" BSPT female end (T1, with the hex) screws onto a 3/4" male thread, and its 1/2" BSPT male end (T2) screws into a 1/2" female thread. Hansen describes it as a "male/female reducing joiner for sprinkler risers, garden hose taps and water filters". It is moulded in New Zealand from glass fibre reinforced nylon, is rated to 16 bar at 20°C, and is tested to AS/NZS 4020:2018 for contact with drinking water. Below you will find Hansen's dimensions, the pressure and temperature ratings, how to check it is the right fitting, and installation tips straight from Hansen.
| Thread Size | Max @ 20°C | kPa @ 20°C | @ 40°C | @ 60°C |
|---|---|---|---|---|
| 6mm – 50mm (1/8" – 2") | 16 bar | 1,600 kPa | approx. 12 bar | approx. 8 bar |
| 65mm (2 1/2") | 12 bar | 1,200 kPa | approx. 9 bar | approx. 6 bar |
| 80mm – 100mm (3" – 4") | 10 bar | 1,000 kPa | approx. 7.5 bar | approx. 5 bar |
Ratings are by the size of the larger thread. The HMFA1520's larger thread is 20mm, so it is rated to 16 bar at 20°C. The 20°C figures are Hansen's published maximum working pressures. The 40°C and 60°C figures are read from Hansen's straight-line derating graph and are approximate. Ratings apply to fittings used with water only and installed to Hansen's specifications. Hansen tests its products for cold water use up to 60°C (140°F) and does not recommend use above 60°C.
Body: high quality glass fibre reinforced nylon (the AS/NZS 4020 test report lists the compound as Polyamide 6 Glass Fibre Reinforced — Durethan BKV 15F). Black, UV stabilised.
The Hansen EasyFit and True Fit range passed AS/NZS 4020:2018 testing (taste, appearance, growth of aquatic micro-organisms, cytotoxic activity, metals and organic compounds) at the Australian Water Quality Centre, report 356792, completed 7 March 2023.
The "Hansen True Fit" range of black plastic threaded fittings holds WRAS (Water Regulations Approval Scheme) approval number 251102715, valid 1 November 2025 to 30 November 2030. WRAS approval shows a fitting complies with the UK water fittings regulations for use on drinking water supplies.
Technical documents are published by Hansen Products (NZ) Ltd.
| Stock | Sizes 15mm–50mm are stocked in store. We hold limited stock of other sizes, and can order them in if needed. |
| Delivery | Courier nationwide. Shipping is calculated at checkout based on your location. |
| Collections | Available from 21 Akatea Road, Glendene, Auckland. |
Hansen sizes are nominal BSP sizes, not the measured diameter of the pipe or thread. A "15mm" thread is a 1/2" BSP thread, and it measures about 21mm across the outside of the male thread.
The HMFA1520 has a 3/4" female end that screws onto a 3/4" male thread, and a 1/2" male end that screws into a 1/2" female thread. For other combinations, a Reducing Bush (HRB) is male on the larger thread and female on the smaller one, a Reducing Hex Nipple (HRHN) is male at both ends, and a Reducing Hex Socket (HSRS) is female at both ends.
Measure across the outside of the male thread you are screwing onto, and of a male thread that fits the female port you are screwing into, and match them to the table below. A 3/4" BSP male thread measures about 26.4mm across and a 1/2" about 21mm.
If you need 3/4" female × 1/2" male, the code is HMFA1520.
| BSP Size | Hansen mm | Male Thread OD (approx.) | Threads per Inch |
|---|---|---|---|
| 1/2" | 15mm | 21.0mm | 14 |
| 3/4" | 20mm | 26.4mm | 14 |
Male thread outside diameters and threads per inch are the standard BSP (ISO 7) values, rounded. Tapered BSPT threads seal on the taper, so measure near the end of the thread.
Hansen's Threaded Fitting Handy Tips: how to apply thread tape and tighten True Fit fittings.
Full step-by-step guide: Hansen threaded fitting installation guide.
T1 is the female thread (the larger end, with the hex) and T2 is the male thread. Both are BSPT tapered threads. Dimensions are from Hansen's HMFA drawing: overall width (a) and overall length (b), in mm.
Reading the drawing:
| Hansen Code | Metric Size | Imperial Size | Female Thread (T1) | Male Thread (T2) | Width a (mm) | Length b (mm) | Max Pressure @ 20°C |
|---|---|---|---|---|---|---|---|
| BSPT female | BSPT male | ||||||
| HMFA1520 | 20 × 15mm | 3/4" × 1/2" | 3/4" | 1/2" | 34.0 | 42.0 | 16 bar |
Using your fittings with anything other than water? Check Hansen's chemical resistance chart for True Fit threaded fittings before you install. Pool and spa chlorine, bleach, strong acids and oxidising agents all attack the material.
View Chemical Compatibility ChartStep-by-step thread sealing and tightening, do's and don'ts, and how to pressure test a new Hansen threaded joint, with Hansen's handy tips video.
View Installation GuideThe larger end, with the hex, has a 3/4" (20mm) BSPT female thread (T1). The smaller end has a 1/2" (15mm) BSPT male thread (T2). Hansen names it the "15x20mm Male/Female Adaptor": 15mm male × 20mm female. It is 34mm wide (a) and 42mm long (b).
Hansen describes it as a male/female reducing joiner for sprinkler risers, garden hose taps and water filters. It lets a 3/4" male thread connect to a 1/2" female thread in one fitting. Use a plastic-compatible thread sealant on both threads.
Hansen makes the HMFA in one size only. For other sizes, a Reducing Bush (HRB) is male on the larger thread and female on the smaller one. A Reducing Hex Nipple (HRHN) is male at both ends, and a Reducing Hex Socket (HSRS) is female at both ends. To close off an unused thread, use a Hex Screw Cap (HCP) on a male thread or a Hex Screw Plug (HSP) in a female thread.
Yes. Hansen True Fit threaded fittings are made from a raw material approved for potable (drinkable) water. The range passed AS/NZS 4020:2018 testing for products in contact with drinking water (Australian Water Quality Centre report 356792, 2023), and the True Fit range holds UK WRAS approval number 251102715, valid to 30 November 2030. Hansen notes the material is suitable for domestic water, not pool or spa water.
Yes. Hansen says to use a thread sealant on all threaded connections, even though the threads are tapered. Use either a thread sealing paste or PTFE (Teflon) tape. Hansen recommends Loctite 5331. The right sealant is non-hardening, compatible with plastic, and doesn't add slipperiness that encourages over-tightening. Wrap tape clockwise when looking at the end of the male thread, starting just back from the first thread.
Hand tight plus one to two turns, and no more. Screw the fitting in by hand until it is firm, then use a spanner or pipe grip on the hex for one to two more turns. Hansen is clear on this: do not over-tighten. Hansen's handy tips video makes the same point: the aim is a good seal, not maximum tightness.
Hansen rates True Fit threaded fittings from 6mm to 50mm at 16 bar (1,600 kPa) at 20°C, so the HMFA1520 is rated to 16 bar. Pressure ratings fall as temperature rises. At 60°C, Hansen's graph shows about 8 bar. The ratings apply to water only, with the fitting installed to Hansen's specifications.
No. Hansen tests its products for cold water use up to a maximum of 60°C (140°F) and does not recommend use above 60°C, because plastic expands as temperature rises. Fittings that fail above 60°C are not covered by Hansen's Limited Lifetime Warranty — so do not use them on hot water lines that run above 60°C.
Both ends are BSPT (British Standard Pipe tapered). This is the standard pipe thread used in New Zealand and Australia. BSP and NPT threads have different thread angles and pitches in most sizes, so don't assume an NPT thread will seal in a BSPT fitting.
No. Hansen's mm sizes are nominal BSP thread sizes, not pipe outside diameters. 15mm is a 1/2" BSP thread, and its male thread measures about 21mm across. Likewise, 20mm is 3/4" (about 26.4mm), 25mm is 1" (about 33.2mm) and 50mm is 2" (about 59.6mm). Match the thread, not the pipe, then use the correct pipe fitting for your pipe type.
Yes. Hansen says True Fit fittings can be used with metal fittings. Use a plastic-compatible thread sealant, tighten to hand tight plus one to two turns, and make sure all pipework is properly supported so the nylon fitting is not carrying the weight of metal pipe or valves.
No. Hansen advises that the high chlorine concentrations in pool and spa water will attack the fitting material. True Fit fittings are only suitable for domestic water, and fittings used on pools or spas are not covered by Hansen's Limited Lifetime Warranty. Their chemical resistance chart also rates bleach, halogens and oxidising agents as bad. See our Hansen chemical compatibility page.
Hansen True Fit fittings are suitable for use above or below ground. However, Hansen does not recommend using any True Fit fittings under driveways, paths or foundations. All pipework must be adequately supported.