2.0HP 2-Speed - Davey QB2002 - Spa Jet Booster Pump - 50mm
2.0HP 2-Speed - Davey QB2002 - Spa Jet Booster Pump - 50mm - Spatex SX200-2 (aftermarket) is backordered and will ship as soon as it is back in stock.
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2.0HP 2-Speed - Davey QB2002 - Spa Jet Booster Pump - 50mm
2.0HP 2-Speed - Davey QB2002 - Spa Jet Booster Pump - 50mm - Spatex SX200-2 (aftermarket) is backordered and will ship as soon as it is back in stock.
ProTip: A more affordable alternative is the Spatex SX200-2 here. Made by the same manufacturer, with same upgraded seals & bearings -- just at a better price!
Davey QB series 2 speed Jet Pumps. This is the second biggest spa jet pump available. 2.5HP. 1500W. 620lpm max flow rate. As of 2023 these pumps come only with an Overmoulded AMP lead suitable for Davey SpaQuip or SpaNet control systems.
Dimensions & Details:
- Wet-end Head can be rotated 90-180° to various position for various installations. Scroll images to see.
- Length: 431mm
- Width: 202mm
- Height: 235mm
- Weight: 14.7kg
-
Warranty: 2-Year Return-to-Base Warranty. Excludes corrosion caused by chemical damage.
Features of the Davey QB Booster Pump Include:
- Double insulated to water circuit – provided with an Equipotential Bonding Point for AS/NZ 3000 wiring standards
- Powerful Pump Performance – Robust pump design combined with powerful motor options delivers high performance, for a satisfying spa experience
- Stainless Steel Pump Shaft – Corrosion resistant 316SS pump shaft to ensure years of trouble-free use, even in salt water spa pool applications, for an extended pump life
- Energy Efficient – Single and two speed models available to help conserve energy during filtration cycles
- Flexible Installation – Pump housing can be turned 180° for easy installation of pipework, horizontal or vertical
- Quiet – Large suction and discharge outlets allow for higher performance but at lower noise levels, ensuring a powerful yet relaxing spa experience
- Enhanced Pump Design – Shielded yoke design helps protect the motor from any adverse leaking from the wet end whilst still meeting all industry safety standards
In plumbing, named sizes are not the actual measurements. A pipe called “50mm” or “2"” does not measure 50 mm across. Instead, it follows nominal sizing, an internationally-standardised naming system.
Use the Outside Diameter (OD) to check your pipe against fittings. Below is a quick reference for common spa & pool pipe sizes:
| Imperial Name | Metric Name | Pipe Diameter (OD) |
|---|---|---|
| 1/2" | 15mm | ~21.2–21.5 mm |
| 3/4" | 20mm | ~26.6–26.9 mm |
| 1" | 25 mm | ~33.4–33.7 mm |
| 1.5" | 40 mm | ~48.1–48.4 mm |
| 2" | 50 mm | ~60.2–60.8 mm |
| 2.5" | 65 mm | ~75.2–75.5 mm |
These are nominal sizes and are designed to fit matching fittings — not to measure exactly what their name suggests. These are based on PVC Pressure Pipe AS/NZ 1477 Dimensions1.
- º Internal diameters vary slightly by manufacturer and class.
- 1 Not all pool/spa fittings match these dimensions exactly. Some do not follow Australian or international standards. Chinese spas may use proprietary fittings.
Understanding Plumbing Sizes & Nominal Measurements
Plumbing sizes can be confusing. PVC and many other pipe systems use nominal sizes—the size is a name, not the exact measured dimension. This convention is used across most pool and spa systems so that pipes and fittings remain compatible.
Why pipe sizes don’t match the measurements
The Nominal Pipe Size (NPS) system standardises pipe dimensions so that pipes, fittings, valves, and accessories interoperate. Plumbers work with these nominal names every day, but DIYers can be tripped up if they try to match by a tape-measure alone.
How to Measure Pipe Correctly
-
Pipe size is identified by:
- The pipe’s Outside Diameter (OD).
- The fitting’s Inside Diameter (ID) (socket opening).
- Pipe Class / Schedule (e.g., Class 9, 12, 18 or Sch 40) relates to wall thickness and therefore the Internal Diameter (ID) and pressure rating.
- The outside diameter of a fitting is not useful (wall thickness varies by manufacturer).
Hose & Tube Dimensions
Common flexible hose sizes used in pool/spa systems (approximate IDs).
| Imperial Name | Metric Name | Inside Diameter (ID) |
|---|---|---|
| 3/8" | 9–10 mm | ~9 mm |
| 3/4" | 19 mm | ~19 mm |
BSP – British Standard Pipe Thread Sizes
BSP thread names are also nominal. The thread OD will not equal the nominal name.
| BSP Thread Size Naming | Outside Diameter (mm / inch) | TPI |
|---|---|---|
| 1/16" BSP | 7.7 mm / 0.304" | 28 |
| 1/8" BSP | 9.7 mm / 0.383" | 28 |
| 1/4" BSP | 13.16 mm / 0.518" | 19 |
| 3/8" BSP | 16.66 mm / 0.656" | 19 |
| 1/2" BSP / 15 mm | 20.99 mm / 0.825" | 14 |
| 5/8" BSP | 22.99 mm / 0.902" | 14 |
| 3/4" BSP / 20 mm | 26.44 mm / 1.041" | 14 |
| 7/8" BSP | 30.20 mm / 1.189" | 14 |
| 1" BSP / 25 mm | 33.25 mm / 1.309" | 11 |
| 1-1/4" BSP | 41.91 mm / 1.650" | 11 |
| 1-1/2" BSP / 40 mm | 47.80 mm / 1.882" | 11 |
| 2" BSP / 50 mm | 59.61 mm / 2.347" | 11 |
| 2-1/4" BSP | 65.71 mm / 2.587" | 11 |
| 2-1/2" BSP | 75.18 mm / 2.960" | 11 |
| 3" BSP | 87.88 mm / 3.460" | 11 |
| 4" BSP | 113.03 mm / 4.450" | 11 |
| 5" BSP | 138.43 mm / 5.450" | 11 |
| 6" BSP | 163.83 mm / 6.450" | 11 |
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Spatex SX200-2 (aftermarket)