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Old 10-12-2021, 07:41 AM   #1
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DEF Caps with Locks

We have a Newmar 2019 MA, we're looking for a locking cap for the DEF tank.
There are 2 sides for the tanks, one is in a locked in cabinet, the other on the driver side has a regular small unlocked door like on a car.
Don't know why one side is locked and other easily opened.
My question, does anyone have a locked DEF cap for the one side. If you do what is the part number for it? Wanting this as a precaution so someone can't put something in DEF tank to contaminate. Thank you for any help.
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Old 10-12-2021, 07:51 AM   #2
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Bought our locking DEF and diesel gas caps through Amazon. Keyed same or different depending on your preference.
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Old 10-12-2021, 08:33 AM   #3
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There are several available from $55. to $24. Listed by various on-line retailers. Google is your friend.
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Old 10-16-2021, 07:30 AM   #4
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I bought one of those locking DEF caps from Amazon for my Entegra (traded). That lock was not very secure and hardly worth the trouble. Maybe there are better ones, but I didn’t buy one for my new RV.

I think with fuel prices going way up the locking fuel caps might be ok. Especially if you store your RV or leave it on a lot unattended for a while. I bought Stant keyed alike caps for my old RV and they worked well.
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Old 10-17-2021, 06:53 AM   #5
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Thank you for response, do you happen to know a part number for the DEF lock cap? I’m having a hard time finding a treaded lock cap.
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Old 10-17-2021, 07:09 AM   #6
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You need to look for a Stant 10525. Iím assuming your DEF tank is the same as the one on my Spartan chassis. If your MA is a Freightliner, then I donít know.
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Old 10-17-2021, 08:03 PM   #7
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Is DEF theft actually a thing? I've never heard of that.
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Old 10-18-2021, 06:52 AM   #8
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I think DEF caps were discussed a few years back not so much from the theft aspect but from the malicious contamination by unknown persons when the coach is unwatched. It doesn’t take much to spoil the chemistry in the DEF tank.
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Old 10-18-2021, 09:21 AM   #9
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We have freightliner, that cap doesn’t work, we need a threaded one. Thank you for responding
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Old 10-18-2021, 09:22 AM   #10
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We’re wanting one not for theft but for tampering & putting something in tank.
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Old 10-18-2021, 09:23 AM   #11
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Exactly!
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