Tower 1G Surface Box with 20mm knock out and mini knockout Product Code: 33241

With 20mm knockout and mini knockout. Robust, heavy gauge material construction. For use with 20mm conduit systems.
Additional Information
Technical Specification
  • Brand : Tower
  • Total Product Weight : 69 kg
  • Pack Size : 1
  • Product Diameter : 20 mm
  • Manufacturer Guarantee : 1 Year Guarantee
  • Pieces in Pack/Case : 1
Product Contents
Delivery & Returns


Standard delivery: €15

Free delivery on all orders over €70.00

Click here to see information on our delivery charges and times



Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


Click here to see information on returns and cancellation

€1.45 Incl. 20% VAT

Add to Wishlist

More Items to Consider

Loading... Loading...
Tower 1G Surface Box with 20mm knock out and mini knockout is rated 4.1 out of 5 by 15.
Rated 5 out of 5 by from Solid surface box The knockouts come out easily and cleanly with a tap from a screwdriver. The plastic is not the type that splinters, so if you wanted to drill more holes in it, that would be fine.
Date published: 2017-03-25
Rated 5 out of 5 by from Back box Good quality box, great value for money, will b te purchasing more in the future.
Date published: 2016-12-10
Rated 4 out of 5 by from Easy to knock and drill out 20mm knock out knocks out easily and cleanly. Sides are uncluttered and can be easily drilled out. Enough clear space to allow 20mm and 25mm back nut to seat cleanly.
Date published: 2016-10-18
Rated 5 out of 5 by from It does the job An inexpensive product that does the job! What can I say about a simple back box? Knockouts can be tricky but take care and it should be OK!
Date published: 2016-04-21
Rated 3 out of 5 by from Knock-outs can be tricky Does the job, but some of the ones I used had knock-outs that refused to budge without cutting. The back can crack if you try to knock out without cutting.
Date published: 2015-05-31
Rated 4 out of 5 by from Surface box 20mm knock out Used these to mount thermostats with cable glands in the knock out holes. I pushed the knockouts from the outside and they broke away cleanly. It requires a fair bit of force. Good price and fine for what I needed.
Date published: 2014-12-11
Rated 5 out of 5 by from Inexpensive and simple For those having issues reliably removing the cut-out, this approach works for me every time... Drill a central hole about the same diameter of your screwdriver, insert screwdriver, and lever to one side. The cutout should then come straight out cleanly.
Date published: 2014-12-03
Rated 4 out of 5 by from Ideal trunking to conduit box Great box for connecting 20mm plastic conduit to plastic trunking. Only gave 4* on performance because the knockout didn't work for the 20 mm hole and had to be drilled. I box was badly broken because of this so beware.
Date published: 2012-12-26
  • y_2017, m_9, d_22, h_21
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.3
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_15
  • loc_en_GB, sid_33241, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix-ie