Do you need -hour cover in case of emergencies? Plumbers, gasfitters and drainlayers who are self-employed also need business skills. Ap provides around-the-clock plumbing services when you need us we’ll be there with a fully stocked truck hours a day, days a year! Th avenue whitestone, ny . We would highly recommend all koegel plumbing services without hesitation! The standard thickness is mm (eps) suitable for mm hydronic.