Winterizing isn't the end of adventure. It's how you make sure the next one starts right. This -50°F antifreeze keeps your RV or boat's plumbing protected through the cold so your first trip starts without a hitch. Great Prices for the best rv fresh water from Prime Guard. Prime Guard RV & Marine Antifreeze -50°F Burst Protection - Ethanol-Based - 1 Gal - 6 Jugs part number PG56ZR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Prime Guard RV Fresh Water
- PG56ZR
Winterize
Antifreeze
Prime Guard
Winterizing isn't the end of adventure. It's how you make sure the next one starts right. This -50°F antifreeze keeps your RV or boat's plumbing protected through the cold so your first trip starts without a hitch.
Highlights
Protects Your Water System During Storage: Guards against light freezes that can damage lines and fittings in RVs and boats.
Works With RV and Marine Plumbing: Compatible with copper, brass, and most plastics (except acetate).
Cost-Effective and Easy to Flush: Ethanol blend flows smoothly through lines and rinses clean when spring returns.
Proven Burst Protection: Meets industry standards for copper pipe burst resistance, keeping your lines intact.
Guards Against Corrosion: Helps protect internal metal and plastic surfaces while your system sits idle.
Bulk Pack Convenience: Six 1-gallon jugs provide enough antifreeze to winterize most RVs and boats.
Features to know about
What is Burst Point vs. Freeze Point?
Labels like -50°F can be confusing. That number refers to the burst point, the temperature where your lines won't burst, not the point where the fluid stays liquid. This ethanol-based -50°F antifreeze provides dependable protection for moderate climates but can start to slush near freezing, making it harder to drain your system. If you're storing your RV in colder regions or for an extended subzero stretch, step up to Prime Guard -100°F RV & Marine Antifreeze (PG96ZR) for reliable freeze protection.
Specs:
Performance:
Type: ethanol-based RV & marine antifreeze
Temperature rating: burst protection to -50°F (not a freeze point)
Intended climate: mild winter conditions
Corrosion protection: yes.
Compatibility:
Applications: RVs, boats, electric vehicles, and seasonal fresh-water systems
Package:
Quantity: (6) 1-gallon jugs
95806 Prime Guard RV & Marine Antifreeze - Ethanol -50°F - 1 Gal - 6 Jugs
Winterizing isn't the end of adventure. It's how you make sure the next one starts right. This -50°F antifreeze keeps your RV or boat's plumbing protected through the cold so your first trip starts without a hitch.
by: Rod11/03/2025
3442498
by: Curtis03/19/2026
3501729
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See what our Experts say about this Prime Guard RV Fresh Water
Brian, for Michigan winters you’re right at the edge of what the ethanol-based Prime Guard # PG56ZR is built for. It gives you –50°F burst protection, which is plenty for typical storage, but if you see long subzero stretches, I’d bump up to the –100°F # PG96ZR. The nice thing is both formulas flush easily in the spring, so you can swap without any hassle.
I also would strongly recommend the -100F option since it is alcohol and glycerin free, meaning the seals will stay protected longer.
How... view full answer...
Yes, Scott, that’s exactly what it’s made for. All three Prime Guard formulas are non-toxic and won’t damage plumbing if left in place for the off-season. Just remember to flush with fresh water before first use.
That said, I strongly recommend going with the glycerin-free options like -50F # PG36ZR and -100F # PG96ZR since they actually help lubricate seals, making them last longer than using budget-friendly ethanol-based antifreeze like -50F # PG56ZR.
Do you sanitize with bleach or... view full answer...
You’ve got it right. The Prime Guard RV & Marine Antifreeze -50°F Burst Protection 6 pack # PG56ZR uses ethanol as part of its base fluid, while the Prime Guard Glycerin Free RV & Marine Antifreeze -50°F Burst Protection 6 pack # PG36ZR eliminates alcohol entirely. The glycerin-free formula is popular with folks who prefer a totally non-flammable, low-odor option. If you’ve ever noticed a slight alcohol smell after de-winterizing, switching to the glycerin-free version will solve that.... view full answer...
Absolutely! All three Prime Guard formulas - # PG56ZR, # PG36ZR, and # PG96ZR - are safe for both RV and marine systems. They’re safe for potable water lines, pumps, and even outboard engine water jackets. Just be sure to flush thoroughly in spring, and it's best to stick with one type of base, rather than mixing ethanol-based with propylene glycol-based.
Which antifreeze brands do you normally use to winterize them? view full answer...
Karen, probably not unless temps dip below freezing for extended stretches. But a light flush with the –50°F # PG56ZR gives inexpensive protection and keeps your lines from freezing if your rig sits unused.
If you also want to keep your seals and fittings conditioned, the glycerin-free # PG36ZR is the better choice. It is alcohol-free and does a nicer job protecting rubber components during storage, so I recommend using this in a light mixture.
If you decide not to go this route, at... view full answer...
After one good flush, any trace taste should disappear, Gerald. The # PG36ZR and # PG96ZR are especially clean-rinsing since they’re alcohol-free. The ethanol-based # PG56ZR might leave a light scent at first, but a vinegar rinse or Camco spring cleaner # CAM40207 clears it right up.
Do you usually sanitize before your first trip out each year? view full answer...
Great question, Skip. The # PG36ZR skips ethanol completely, which makes it gentler on seals and fittings over time. Some owners prefer it because it’s non-flammable and doesn’t have much of a scent at all. The ethanol-based # PG56ZR is more budget-friendly and works great for most rigs in more southern climates - especially if you flush each spring.
Are you winterizing an RV or a boat? view full answer...
Doug, typically about 2–3 gallons will do the job on a travel trailer, but on a class A you are better off with about 4-5 gallons. Since Prime Guard comes in a six-jug case, you’ll have plenty.
If you’re in an area that dips below zero, use the premium -100°F # PG96ZR otherwise, the –50°F # PG36ZR or # PG56ZR will do great.
How’s your rig stored - covered lot or open pad? view full answer...
Mark, for Illinois you’re right on the border between the –50°F and –100°F options. The standard # PG56ZR ethanol-based blend will usually handle normal Midwest winters just fine, but if your rig sits in unheated storage for weeks of deep freeze, step up to the premium # PG96ZR for peace of mind. It costs a little more but adds serious protection against those random cold snaps.
Do you store indoors or outside over winter? view full answer...
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