Tesla Sealed System Filling Kit – With Pressure Gauge, Filling Loop & 3 Bar Safety Valve The Tesla Sealed System Filling Kit is a compact, all in one solution for installing and maintaining sealed central heating systems. Used with an expansion vessel and mounting bracket, this kit has everything you need for safe system pressurisation and pressure relief. Ideal for new installs and upgrades, the Tesla kit includes a pre-assembled connection manifold, pressure gauge, 3 bar safety relief valve and a flexible filling loop with double check valve and isolators. A convenient, time saving kit used by heating engineers for years. Why Choose This Product? Complete Kit