The Flow Security Systems | Heating Oil Tank & Above Ground Commercial Tank Locking Cap | Prevents Theft & Fuel Vandalism | FSS 750 | Quick Fill Pattern

This lock is very heavy duty, and really works well. I have the quick fill type of tank fill pipe, and the unit fits perfectly. It took me a minute to figure out which way to turn the key to lock and unlock the cap because when locked, the cap spins freely (it just won't unscrew). I completely disagree with the person who said that the lock did not work, and that all you had to do was push down and wiggle and the cap would unscrew. When I read that review I went out and tried, and there was no way that it was going to just unscrew, no matter how hard I pushed or wiggled it while turning. It just kept spinning, but would not unscrew. He probably did not fully seat the cap before trying to unscrew it.A locking cap is not a fool-proof method for keeping people out of your oil tank because there are always pipe wrenches and hacksaws. But this cap makes your oil tank much less thief-friendly. It can also keep the oil delivery company from topping off your tank when you don't want it topped off.Great customer service, they called before shipping to make sure what type of oil fill cap we had.

I give it 5 Stars!

This review is for the quick thread (NY) version of this product.- Great customer service, the company rep called me to make sure I was ordering the right product; he even recommended I picture message my cap if I wasn't sure- The cap feels very solid and well put together- The lock housing has a hinged closure with magnet so it'll stay closed and protected.- Installation was easy, screw it on and turn the key (I yanked on it quite a bit an could get no shimmy or leverage)I would highly recommend this product. I didn't purchase this for fear of oil theft but of unscheduled deliveries. In speaking to the owner alot of customers seem to purchase this to keep the oil companies for unscheduled deliveries. My oil company was supposed to get my permission first but had and "oops" moment and delivered 200 gallons, I guess they want to offload before fuel oil prices come down!!!

I recommend for safety

I bought this for my fuel tank. Thought it would work really good, got it on but cannot get it off. I've tried everything.

These are heavy made and so worth it in my opinion. They are a little difficult to unlock the first few times due to learning how. But locking my fuel cap is vital so it’s worth the effort to learn. Very happy with these!

I love this product. This act of locking my fuel cap keeps me from forgetting to put it back on when in a hurry.

Lock stopped working

Thieves siphon the tank. This stops then like a mofo. It’s righteous.

Pros: no one will be stealing oil.Cons: I can’t get it off.I threaded this on hand tight and now it doesn’t come off. When ‘locked’ it free spins as it should, but when ‘unlocked’ it catches, and then trying to twist it off, it breaks loose and catches again. Does not come off.

I put this on my tank. Works great. After having over $1500.00 of furnace oil stolen from me last fall, I was finally able to get this cap. Screw it on tight, turn the key and it spins freely. Hopefully my delivery guy will use it correctly.

No instructions how to use it

Tidy tank