
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.
Explore Trappex productsShop hotun dry trap tundishes and detect alarm units from RA Tech UK, founded by British inventor Russell Armstrong.
Supplier-direct delivery: dispatched directly by hotun using Royal Mail Tracked 48. UK delivery is £7.56 including VAT per hotun item. Products from other suppliers may arrive separately with their own delivery charge. For more than 10 hotun items, please contact us before ordering.
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

Founded by British inventor Russell Armstrong, RA Tech UK Ltd is the company behind the innovative hotun range of dry trap tundishes and discharge detection products. Developed to solve real challenges faced by plumbing and heating engineers, hotun combines clever design with practical engineering to improve the visibility of safety valve discharges and help identify potential system faults.
Shop hotun products →
STAK Engineering is a UK manufacturer behind a pipe-mounted laser tool invented by Leigh Anthony Williams and William Anthony Williams. Its design projects a laser dot to help mark hole centres for pipework, reducing reliance on tape measures and plumb lines.
Explore STAK tools →