
Trappex
Heating-system protection developed from hands-on gas engineering experience, with practical products designed to protect systems from debris, trapped air and pressure problems.
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£4.99. Digital PDF download. Nothing sent in the post.
Work through a boiler-and-cooker installation with Derek's practical teaching, then try a longer pipe run and check your answers.
You need the LCL Awards LPG Gas Safety Training Manual, Issue 5, tables E1 and E1a on page E3. The reference tables and manual are not included. Already own it? You do not need another copy.
View the LPG manual. Sold separately. Delivery charges apply to the printed manual.
For learners and engineers practising propane pipe-sizing calculations for copper pipework in permanent dwellings. It does not cover butane, leisure vehicles, CSST, proprietary fitting systems or sizing the supply and regulator.
This is a PDF to read on screen or print. The practice pages are for handwriting. It does not calculate or check your answers.
If we identify an error in a digital booklet you purchased, we’ll provide a corrected digital copy at no extra charge. Your purchase does not include every future edition: expanded editions containing additional teaching material may be sold separately. Purchasing an expanded edition is optional. This does not affect your statutory rights.
This purchase is for one person, for their own learning and reference. You may save the PDF on your own devices and print copies for your own use. Except where permitted by law, sharing with learners, uploading to a training platform, or displaying or reproducing this workbook for classroom teaching requires a separate TomKat licence. No resale or redistribution.
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Independent TomKat teaching aid. Use alongside appropriate training, applicable standards and manufacturer instructions. This is not an LCL or BSI publication or a complete installation or commissioning procedure.
Edition 1, v1.0, 16 October 2026. Original TomKat teaching text and design © 2026 TomKat Gas Training Ltd. Third-party rights remain with their owners.
PRACTICAL IDEAS FROM OUR INDUSTRY
We’re proud to support useful innovations created by people who understand the trade. These are products chosen for the genuine problems they solve for engineers and their customers.

Heating-system protection developed from hands-on gas engineering experience, with practical products designed to protect systems from debris, trapped air and pressure problems.
Explore Trappex products →
Invented by Birmingham electrician Neo Mosudisa after he encountered a real safe-isolation problem at work. One thoughtful idea, developed to help engineers work more safely.
Discover Spurlok →
Created by Chris Jepp to make topping up sealed heating systems simpler and help prevent over-pressurising and unnecessary water waste.
Not currently stocked by TomKat