We will not know what page you are responding to. Please give us as much detail as possible so we can provide the best response (product, model, p/n, manufacturer, size, quantity, etc.)
If you are looking for regulators, the following is also helpful: gas type, inlet, and outlet pressure (PSI or WC), flow range (BTU/H or CFH), desired pipe size, application, regulator location (inside or outside? Is noise an issue?)
