
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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Five TomKat natural-gas and heating reference sheets in one pack. Choose plain or laminated, and add the complete set to your basket in one step.
You receive five separate A4 sheets, one of each design. Four are landscape; the inspection preparation sheet is portrait. The Y-plan, S-plan and inspection preparation sheets are printed on both sides. This is a fixed set; duplicate designs and mixed finishes are not included.
Plain pack: £0 for the five sheets, plus £3.99 printing, packaging and UK Second Class postage. Total £3.99. This is a convenient way to order the full set; no saving is claimed.
Laminated pack: £4.50 for all five laminated sheets, plus £3.99 printing, packaging and UK Second Class postage. Total £8.49. Five individual laminated sheets normally cost £5 before postage, so the pack saves 50p — 10% off the laminated sheets. The discount does not apply to postage. Each sheet is sealed in a clear protective pouch.
One natural-gas pack per order. Choose plain or laminated, not both. Do not add individual copies of designs already included in this pack. You can order the LPG two-sheet pack alongside it: postage for both packs together is £7.49. Other products may have separate delivery charges. Postal service only.
These are TomKat learning aids, not complete installation or testing procedures. The pipe-sizing worksheets need the matching LCL manual tables; manuals and standards are not included. The inspection preparation sheet provides selected reminders, not an exhaustive list, an official Gas Safe checklist or a working procedure, and does not guarantee an inspection outcome. Follow your appointment instructions and current requirements for the work. Use the IGEM worksheet alongside the full IGEM/UP/1B Edition 4 standard and relevant training. The Y-plan and S-plan examples cover conventional 230 V, five-wire arrangements; follow the actual equipment instructions and safe-isolation requirements.
Prefer to print them yourself? Free sheet downloads are available through Resources on the TomKat Gas Training website.
Your order covers the versions supplied. Later updates do not include an automatic replacement printed or laminated pack. A new print-and-post order is charged at the prices shown at that time. This does not affect your statutory rights.
Original TomKat teaching content and design © 2026 TomKat Gas Training Ltd. Personal study or own work. No resale or republication. 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 →
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Created by Chris Jepp to make topping up sealed heating systems simpler and help prevent over-pressurising and unnecessary water waste.
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