Insulated Faucet Covers for House Spigots and RV Park Hydrants

What a cover does, and what comes before it

Insulated hose bib covers, hose bib winter covers, faucet socks and hydrant bags are all the same idea: a layer of insulation around the part of the plumbing that sticks out into the cold. Insulation contains no heat source. It slows the cooling, and that is all it does.

That is why the cover is the last step, not the first. The Portland Water Bureau lists the order for a faucet you do not need in winter:

1. “Disconnect hoses from outdoor faucets.”
2. “If you have a separate outdoor water shutoff valve, turn off water to outdoor faucets.”
3. “Open each outdoor spigot to drain the remaining water from the pipes.”
4. “Insulate all outdoor faucets and hose bibs with molded-foam hose bib covers.”

Frost King, which makes faucet covers, gives the same logic from the other side: close the interior shut-off valve and drain the faucet if there is one; where a spigot has no separate valve, cover it. The page on the frozen spigot explains the two situations in full.

Three types, sorted by the faucet they fit

Frost King's own covers are not among the products linked on this page. Its pages are quoted because they are the only maker descriptions of the types that we could read. The linked covers come from marketplace brands, and everything stated about them is listing data. For that reason none of them carries a recommendation; see how we compare.

Covers for wall spigots at the house

Padded sock, 2-pack (nabreeli). According to the seller, each cover is 5.9 in wide, 8.5 in tall and 1.9 in thick, built from two layers of 600D Oxford fabric around a layer of insulation cotton, with an adjustable strap and a reflective strip. It is a soft cover, so it can follow a faucet that does not sit square to the wall.

Rigid foam shell, 2-pack (marinexplore). The seller describes an EPS foam shell with a 1.5 cm insulating layer, a rubber gasket at the rim and a drawstring that tightens it against the wall. The listing's data field gives 7 in by 5 in by 9 in. A shell only seals where the wall around the faucet is flat enough for the gasket.

Both are sized for a faucet with nothing screwed onto it.

Covers for yard hydrants and RV park hydrants

The 35 in bags are described by both sellers as made for RV park hydrants, which the listings call longer than standard hydrants. The DEMEDO listing says the extended design lets the cover reach the ground. Its seller also offers a shorter version and tells buyers who do not need the length to take that one.

The 25 in bag is the middle size. Its seller asks buyers to measure their equipment before ordering, which is the right instruction for every cover on this page.

None of the three listings names a test, a temperature or a duration. The material names are the sellers' statements.

A faucet that stays in service

At a winter campsite or a barn, the faucet cannot be drained, because a heated water hose hangs on it and the water has to run. The hose does not warm the faucet: the PIRIT manual says its hose “is NOT designed to provide freeze protection to your water supply.” A tall bag over hydrant and riser is then the first measure, with three limits:

• The thermostat stays outside the bag. PIRIT requires it to be “exposed to ambient temperature” and not “in an insulated compartment of any kind.”
• The hydrant is not yours at a campground. Ask the park before covering it.
• Insulation buys time, not safety. How much time, nobody states.

Covers with a heating element inside are a different product with different open questions; they are on the page about heated faucet covers. Foam tubes and wrap for the bare riser and the pressure regulator are sorted under insulation for hoses and fittings.

What to measure and check before buying

• Height and girth. For a wall spigot: how far it stands out from the wall and how wide the handle is. For a hydrant: top to ground, and around the widest point.
• The wall. A rigid shell needs a flat surface for its gasket. On rough stone or lap siding a sock closes better.
• The closure. A drawstring or strap you can tighten with gloves is worth more than a thicker fabric.
• What stays connected. Vacuum breakers, splitters and timers make a faucet longer than the covers for bare spigots allow.
• The number of faucets. The covers for wall spigots here are 2-packs; the hydrant bags are single pieces.

Typical mistakes

• Covering instead of draining. A cover over a faucet full of standing water only delays the freeze.
• Leaving the hose on under the cover. Woodford warns that a hose attached during freezing weather traps water in a frost-proof faucet, “which may cause the faucet to freeze and burst.” What to do when that has already happened is on the page about a hose frozen to the spigot.
• Buying by thickness alone. A thick cover that does not close at the wall or at the ground leaves the cold a way in.
• Putting the cover over a heated hose's thermostat. The heater then reads the air in the bag.

Bottom line

Pick the type by the faucet: a foam shell or a sock for a bare wall spigot, a 25 or 35 in bag for a hydrant on a riser. Do the draining first. All five covers shown here rest on seller statements, so check size and closure on arrival.

For the hose that came off the faucet, the guide on how to keep a garden hose from freezing and the page on the garden hose in winter cover storage. If the water has to stay connected through the cold, the page on heated RV water hoses compares the hoses made for that.