Astralpool Viron Ignition DSI Spark & Pilot - Hurlcon Astralpool - Techrite
Astralpool Viron Ignition DSI Spark & Pilot - Hurlcon Astralpool - Techrite - Viron Pilot Techrite 78199/79153 R310 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.
Delivery and Shipping Info*
Delivery and Shipping Info*
Free Shipping over $99 for most products. Choose Express Post for fastest shipping!
Astralpool Viron Ignition DSI Spark & Pilot - Hurlcon Astralpoo...
Astralpool Viron Ignition DSI Spark & Pilot - Hurlcon Astralpool - Techrite - Viron Pilot Techrite 78199/79153 R310 is backordered and will ship as soon as it is back in stock.
Astralpool
Gas Ignition Control Module. Suits Older Hurlcon and Astralpool Gas Heaters (usually before 2012) with Spark or Spark+Pilot Ignition. Originally blue in colour, then gray, and now beige. If module shows any sign of warping, melting, etc, it must be replaced.
Suits some Hurlcon and AstralPool Viron 250, Viron 350, Viron 400, Viron 450, Viron 550. Does not suit any Viron eVo gas heaters.
This is "DSI" Direct SPARK Ignition Version or the DSI PILOT Ignition Version. See below for more information.
Techrite AIS / Automatic Ignition System - Pilot
- R310 - Pilot
- 6.3mm spark spade terminal - older versions had a smaller spark terminal
- Max Load: 4A
- Ionization Current: 3uA
- Startup Time: 2 sec
- Safety Shutdown: <1 sec
- Ambient Temp: 0-60C
- IP Rating: 20
- TAIS C0-R310-D5-5-303060HRV TAIS0021 <--this may vary
- P/N 78199 / 79153
- Warranty: 6 months. Excludes damage from overheating.
Techrite AIS / Automatic Ignition System - Spark
- R33 - Spark
- 6.3mm spark spade terminal - older versions had a smaller spark terminal
- Max Load: 4A
- Ionization Current: 3uA
- Startup Time: 2 sec
- Safety Shutdown: <1 sec
- Ambient Temp: 0-60C
- IP Rating: 20
- TAIS C0-R33-S-303060HRV <-- this may vary
- TCAIS CO-R33-S-303060HRV
- P/N 78138 / 79152
Information above subject to change with various revisions.
Manufacturer Catalogues, Diagrams & Part Numbers
Need exploded views, spare part numbers, product numbers, diagrams, or more product information? See the manufacturer catalogues: AstralPool Catalogue 2026 | Zodiac Catalogue 2026
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 |
Payment & Security
We accept: Visa, Mastercard, Amex, Apple Pay, Google Pay, ShopPay, Paypal, Zip, Afterpay
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
SP79153