I have a 2" line running vertically - about a 4' section. This is for a pump-out on a dock (sewage). I'm replacing all the support backing and hardware with stainless. Currently the pipe is supported with pipe straps. I was thinking of using straps again but I can't seem to source them in stainless. I can get U-bolts in stainless but was thinking the larger amount of surface area on the pipe strap might be safer. Thoughts?

My outside faucet has a shutoff valve in the garage as shown in the photo (red one). I tried to turn off the water like all previous years in preparation for winter. Oddly, even after I turned the valve until it is tight, the water at the faucet is only reduced to maybe 20% of the max flow. I marked the "off" position with a silver marker previous years so that when it is facing towards me, it was off. As I was tightening the valve, a few drops of water leaked out of the stem but as I tightened it further it stopped leaking. The valve is 36 years old but I only use it twice each year. I could try to tighten the valve with more brute force but I'm worry that could make things worse. But if I don't turn off the water the pipe may freeze and burst (happened a few times in previous years). What should I do? It does not show in the photo, but there is T join between the two valves. I believe the water main comes in on the left side, passes through the house shut-off valve (black), then split into two paths: one goes to the outside faucet and the other one to the rest of the house.