40mm Spa Flex Flexible PVC Pressure & Suction Pipe (48mm OD) - SpaFlex

$72.00 $132.48

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3m Spa Flex - Flexible 40mm PVC Pipe Tube - Cl18 15m Spa Flex - Flexible 40mm PVC Pipe Tube - Cl18 0.4m Spa Flex - Flexible 40mm PVC Pipe Tube - Cl18

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USA Made Class 18 Pressure & Vacuum Schedule 40 Fitting Compatible

40mm (1.5") SpaFlex® Flexible PVC Pressure & Suction Pipe

Premium flexible PVC hose for spas, hot tubs, pools, and irrigation. Made in the USA by leading manufacturers of spiral-reinforced flexible PVC, designed for reliable pressure (Class 18) and vacuum/suction applications. This is not the low-quality import hose that often fails sizing and leaks—this product is built for long service in Australian conditions. Tip: Also suitable as vacuum pipe for spa/pool suction lines.

Fits standard PVC/CPVC pressure fittings: true 40 mm nominal size with approx. 48 mm OD. Glues into standard Schedule 40 (pressure) socket fittings.

Key Features

USA-Made quality flexible PVC with spiral reinforcement for tight bends and fewer fittings.
Class 18 rating for pressure lines; equally suitable for vacuum/suction runs.
Chemical & UV resistant for spa/pool environments; built for durability.
Schedule 40 fitting compatible—installs like rigid pressure pipe, but bends to route around obstacles.
Common 40 mm size used across most spa & pool brands (pumps, jets, blowers, suctions, returns, water features).
Accurate sizing that meets Australian standards—unlike many poorly sized imports.

Available Lengths

Length	Notes
0.4 m (400 mm) Pre-cut	Multiples supplied as separate pieces (e.g. 4 × 0.4 m = 4 pieces)
3 m	Straight cut for most installations
15 m roll	Best value for larger jobs

Tech Specs

Nominal size: 40 mm (1.5")
Outside diameter (OD): ~48 mm
Class: 18 (pressure)
Material: Spiral-reinforced flexible PVC
Compatibility: Standard PVC/CPVC pressure (Schedule 40) socket fittings
Applications: Pumps, jets, blowers, suctions, returns, water features, irrigation, vacuum pipe
Country of origin: USA

Installation Notes

Warm to flex: Use mild heat (e.g. heat gun) to increase flexibility.
Primer + Flexible-PVC Glue required: Use a proper primer and a Flexible-PVC adhesive. Regular rigid PVC glue will eventually leak because it does not flex or fill properly.
Sunlight warning: Do not leave exposed to direct sunlight for long periods, as discolouration will occur. At minimum, cover or paint the pipe if installed outdoors.
Ensure clean, square cuts; dry-fit before gluing; twist & hold joint until initial set.

Why USA-Made vs. cheap imports?

Correct sizing & standards: True 40 mm nominal sizing for Australian fittings.
Better materials & reinforcement: Resists collapse, cracking, and kinking.
Fewer leaks, longer life: Designed for continuous spa/pool duty.

Note for non-plumbers: PVC pressure pipe uses nominal names that do not equal the measured OD. This 40 mm pipe measures ~48 mm OD. Please review our PVC Pressure Pipe Dimensions Guide before ordering.

Specs apply to Spa-Flex® flexible PVC hose. Working pressures are for open-end applications only.

Nominal Size	Approx OD	Rec. WP @ 72°F	Design Burst @ 72°F	Approx Burst @ 140°F	Rec. Min Bend Radius	Approx Weight
1/2"	0.84" (~21.3 mm)	100 psi	400 psi	180 psi	2" (~50.8 mm)	0.15 lbs/ft
3/4"	1.05" (~26.7 mm)	100 psi	400 psi	180 psi	2" (~50.8 mm)	0.23 lbs/ft
1"	1.315" (~33.4 mm)	100 psi	355 psi	180 psi	3" (~76.2 mm)	0.31 lbs/ft
1-1/4"	1.66" (~42.2 mm)	80 psi	250 psi	120 psi	4" (~101.6 mm)	0.40 lbs/ft
1-1/2" (40 mm)	1.90" (~48.3 mm)	65 psi	200 psi	100 psi	5" (~127 mm)	0.49 lbs/ft
2" (50 mm)	2.375" (~60.3 mm)	60 psi	175 psi	90 psi	6" (~152.4 mm)	0.68 lbs/ft
2-1/2" (65 mm)	2.875" (~73.0 mm)	60 psi	175 psi	90 psi	7" (~177.8 mm)	0.95 lbs/ft
3"	3.50" (~88.9 mm)	60 psi	175 psi	90 psi	8" (~203.2 mm)	1.28 lbs/ft

Source: Pacific Echo Spiralite® Spa-Flex® 710-00 technical data. *

* Published working pressures are for open-end applications only.

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"	25 mm	~33.4–33.7 mm
1.5"	40 mm	~48.1–48.4 mm
2"	50 mm	~60.2–60.5 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.

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.

Quick example: A 2" / 50 mm fitting is named for the pipe it connects to, but the pipe’s actual outside diameter (OD) is approx. 60.3 mm (typically ~60.2–60.5 mm in AS/NZ pressure pipe).

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).

Important: For pool/spa work, most plumbing uses Pressure Pipe (AS/NZ standards) — not DWV. Always check OD and the pipe class against your equipment specifications.

PVC Pressure Pipe AS/NZ 1477 Dimensions¹:

Common nominal sizes with typical outside diameters and indicative inside diameters by class.

Imperial Name	Metric Name	Outside Diameter (OD)	Class 9 IDº	Class 12 IDº	Class 18 IDº
1/2"	15 mm	~21.2–21.5 mm		18.3 mm	17.8 mm
3/4"	20 mm	~26.6–26.9 mm		23.7 mm	22.4 mm
1"	25 mm	~33.4–33.7 mm	30.5 mm	29.8 mm	28.1 mm
	32 mm	~42.1–42.4 mm	38.5 mm	37.5 mm	35.4 mm
1.5"	40 mm	~48.1–48.4 mm	45.2 mm	44.1 mm	42.8 mm
2"	50 mm	~60.2–60.5 mm	55.2 mm	53.7 mm	50.5 mm
	65 mm	~75.2–75.5 mm	68.9 mm	67.0 mm	63.2 mm
2.5"		~73 mm

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.

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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