PVC pipe sizes

Here are some PVC pipe sizes available in Australia

These tables come from the IPLEX website. Vinidex list the same sizes, but no additional ones.
For the second table, I have added the last column, which was missing from their data.
The highlighted rows are sizes that I have used. All measurements are in mm

Sewer Pipe

Nominal Dia	Class	Mean Outside Diameter	Mean Wall Thickness	Mean Inside Diameter
32	SH	36.3	2.1	32
40	SH	42.9	2.2	38
50	SH	55.8	2.2	51
65	SH	68.9	2.9	63
80	SH	82.5	3.1	76
100	SN6	110.2	3.0	104
100	SN10	110.2	3.5	103
150	SN4	160.3	4.0	152
150	SN8	160.3	4.8	150
225	SN4	250.4	6.1	238
225	SN8	250.4	7.6	235
300	SN4	315.5	7.7	300
300	SN8	315.5	9.6	296
375	SN4	400.5	9.7	381
375	SN8	400.5	12.1	376

 

Stormwater Pipe

Nominal Dia	Mean Outside Diameter	Mean Wall Thickness	Mean Inside Diameter
75	75	1.6	71.8
90	90	1.9	86.2
90 extra heavy	90	2.5	85
100	110	2.4	105.2
150	160	3.2	155.6
225	240	5.0	230
300	315	6.0	302
375	400	7.9	384.2

 

In Australia, the 90mm stormwater comes in grey, green or white. The green is the recycled product, and is becoming more common. The grey looks better, so it pays to ring ahead to see if it's in stock

If you a confident that you will only be building one speaker, you can buy short (1metre or 3m) lengths of some sizes from Bunnings.

If you have the merest suspicion that you might build others later, I would suggest you buy a full length (6m). The best place to buy it is from the trade desk of your local plumbers supplier. This will be about 3/4 the price of buying it through a hardware store, even the larger ones such as Bunnings.

The most recent prices I paid were $36.00 for 6m of 100mm sewer pipe (May 2008)
and $22.00 for 6m of 90mm stormwater. (April 2008)
The larger sizes can be very expensive - I had to buy a 6m length of the 225mm pipe for $160aus, and that was trade price! If you know any plumbers, you might be able to scrounge an offcut. Last time I looked, the going rate was a carton of beer, which is good value!

By way of comparison, here are some recent Bunnings prices (May 2008) Note these are for 3m lengths, not 6m as shown above.

Size - 3 metre lengths	Bunnings Price
50mm sewer	$14.50
65mm sewer	$26.50
90mm stormwater SN2	$13.50
100mm SN6 sewer	$21.90
150mm SN2 stormwater	$49.00