Gas Plumbing Job (redwood city)

Need help of a professional gas plumber with gas license to install safety shut off valve on a gas line.
We have a 1/2 in steel vertical gas line we need to cut and insert a safety shut off valve.
For an experience professional the job should not take more than an hour to complete.
Please write back with a brief description of your professional experience and your all-in cost for labor only.
$250 or best offer.
The job is available for immediate start, and more pluming work is available if the job is done on time and with good quality.