What is this P20 housing i keep hearing about. Is that easy to fit, How much do they cost and where do I get one from?

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BTS Bathroom Renovations/Tiling
Phone: 0406647612
phone: 93091975
[email]brendanstiling@iinet.net.au[/email]
[url]www.brendantiling.yodel.com.au/[/url]