I need an outdoor junction box for 12.9mm armoured cable. I see that the holes on this are M20; is there space to drill out to M22?

Hi, thank you for your product enquiry.The knock-outs are 20mm diameter as standard but also have provision to be drilled out to a maximum size of 25mm, so they would be suitable for your requirements.

Are there terminal/conection points inside this junction box, Could really do with a picture of what's inside really.

Yes, there are terminal connectors inside the box. They are comprised of a (loose) strip of ordinary insulated connectors. It all works, 'though I would have preferred the connectors secured to the base of the box, like a junction box.

For the junction box if a cable comes in through the back how do I make it waterproof for water running down the wall?

You can buy a Wiring Grommet Rubber https://www.amazon.co.uk/FIXMAN-255645-Rubber-Grommets-35pce/dp/B01MA6T2HD/ref=alp_dpwidget_a_w_?th=1&psc=1&smid=A3P5ROKL5A1OLE If you search enough you can buy individual. I would suggest you also use a circle of sealant around the box for extra precaution.

Manufacturer	Nexus (Jiaxing)
Part Number	WP14-01
Product Dimensions	228.6 x 165.35 x 228.6 cm; 199.58 g
Item model number	WP14-01
Colour	Grey
Style	Single 2-Way Outdoor Weatherproof Retractive Press Switch
Pattern	Single
Wattage	4.8E+3
Item Package Quantity	1
Switch Type	2-way
Batteries included?	No
Batteries Required?	No
Item Weight	200 g

BG Electrical Outdoor Retractive Single Wall Press Switch with LED Indicator, Weatherproof Storm, 2 Way, Grey, 20A, IP66 Rated, WP14

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