Mechanical Seal for SpaNET Davey QB, LX Whirlpool, SpaNet Spa Pumps
Mechanical Seal for SpaNET Davey QB, LX Whirlpool, SpaNet Spa Pumps is backordered and will ship as soon as it is back in stock.
Don't Guess - Ask Us!
Don't Guess - Ask Us!
Not sure if it’s the right part? Send us a message and a photo of what you’re replacing, or what you need, and we’ll help make sure you get the right part the first time.
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Delivery and Shipping Info*
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Mechanical Seal for SpaNET Davey QB, LX Whirlpool, SpaNet Spa Pumps
Mechanical Seal for SpaNET Davey QB, LX Whirlpool, SpaNet Spa Pumps is backordered and will ship as soon as it is back in stock.
Mechanical Seal Kit to Suit Davey QB, LX Whirlpool, Spanet Jetmaster Spa Pumps
Premium replacement mechanical seal kit to suit a wide range of SpaNET Jetmaster, Davey QB Series, and LX Whirlpool spa pumps. This seal assembly is the common 5/8" booted cup with 3/4" ceramic face style used on many popular spa and spa bath pump models.
We keep many of these physically in stock for fast shipping or local pick-up.
Common cross references include SB16, SB16SP, D-SB16SP, and LX-SPASEAL. This seal type is commonly listed for Davey QB, LX, and SpaNET XS / Jetmaster pump applications. Always confirm by measurements and seal style before ordering.
Compatible Pump Models
- Davey QB Series: QB035, QB1501, QB2001, QB2002, QB2501, QB2502, QB3001, QB3002
- SpaNET / Jetmaster: XS30, XS-30, XS-30S, XS30-2S, XS30-3P, XS20-2S, XS3C, XS-3C QuietFlo
- LX Whirlpool: TDA, WP, LP, EA, JA Series, including JA35, JA50, JA75, JA100, JA150, JA200, LP150, LP200, LP250, LP300, WP200, WP200-II, WP250, WP250-II, WP300-II, WP500, EA390, EA450, TDA100, TDA150, TDA200
Common Part Numbers / Cross References
- SB16
- SB16SP
- D-SB16SP
- LX-SPASEAL
Seal Dimensions
- Spring Section OD (with rubber): 41.5mm
- Spring Section ID: 17.4mm
- Ceramic Section OD (with rubber): 35.5mm
- Ceramic ID: 18.95mm
- Seal Type: 5/8" Booted Cup with 3/4" Ceramic Face
Quality Matters
A worn or incorrect mechanical seal can allow water to leak along the motor shaft and damage the pump motor. This replacement seal is a quality aftermarket spare designed for reliable sealing performance and long service life when correctly fitted.
Cheap low-grade seals often use inferior rubber compounds, weaker springs, or inconsistent ceramic faces, which can lead to early leakage and repeat failures. That is why seal quality matters.
Important Before Ordering
- Please compare the seal style, measurements, and pump model before ordering.
- Some early, uncommon, or non-standard Chinese pump variants may use a different seal.
- SpaNET identifies this seal set for models including XS3C, XS30, XS30-S, XS30-2S, XS30-3P, and XS20-2S. :contentReference[oaicite:2]{index=2}
- Mechanical seals are a wearing part and life span can vary depending on water balance, chemical condition, and pump run time. :contentReference[oaicite:3]{index=3}
- If unsure, send us clear photos of your old seal and pump model details before purchase.
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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lxlp-002 / SPASEAL