Need a drain unblocked, or have a problem with your drain? If your pressure gauge has dropped to -bar, that doesn’t necessarily mean it’s faulty; that’s just as good an indication of a leak, as a faulty pressure gauge. We handle every plumbing project with the same professionalism and expertise you won’t be disappointed for choosing sal manzo plumbing and heating inc request your quote today! If emergency boiler repairs or service will not solve your problem, our. The drain.