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Campbell Well Caps
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Type
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$238.08
Campbell Aluminum / ABS Watertight Well Cap
Campbell
Campbell Aluminum / ABS Watertight Well Cap
- Price
- From $81.42
Campbell Well Caps
Watertight & Vented Well Caps
Campbell Well CapsAluminum · ABS · Watertight · Vented · Locking
Watertight aluminum and ABS well caps and vented caps for jet-pump, submersible, and pitless installations. 4 in, 5 in, and 6 in casing sizes plus oversize 6 1/4 in and 6.9 in PVC. Locking models for tamper-resistant installs.
4–6.9"
Casing Range
2
Types (WT + Vented)
3
Materials
34+
Catalog SKUs
Watertight vs Vented — Which to Use
A well cap protects the casing top from rain, snow, insects, rodents, and surface debris. The right choice depends on whether your system needs atmospheric balance.
Watertight Well Cap
Sealed · Submersible · Modern Standard
Sealed gasket cap with no atmospheric vent. Standard for submersible installations — the pump pressurizes the system, no atmospheric balance needed. Aluminum or ABS body, neoprene gasket, conduit knockout for power leads. Several with 1 in plug option for vent or future tap.
SealedYes · gasket
MaterialsAluminum · ABS
Sizes4, 5, 6, 6 1/4, 6.9 in
Best ForSubmersible · permanent
Vented Well Cap
Atmospheric Balance · Jet Pump
Vented cap with screened ports for atmospheric pressure balance. Required on jet-pump installations and pitcher-pump wells. Screen prevents insect intrusion while allowing air exchange. Aluminum or ABS construction. C-series, K-series, and JC pitless jet caps.
SealedNo · screened vents
MaterialsAluminum · ABS
Sizes4, 5, 6, 6 1/4, 8 in
Best ForJet pump · shallow well
Locking Watertight Cap
Tamper-Resistant · Commercial / Public
Aluminum locking cap with padlock provision. Required on commercial wells, multi-family systems, and any well where unauthorized access is a risk. Same watertight seal as standard models with added security. LWC6 fits 6 in steel casing.
LockPadlock provision
MaterialAluminum
Size6 in
Best ForCommercial · public access
Imprinted & Specialty Caps
Custom Imprint · Pitless · PVC
Caps with factory IMP imprint for branded contractor installs. Pitless-specific caps (C5-6U, JC6) with the right contour to seat over a pitless adapter cover. Specialty PVC casing caps (LSW-614, LSW-614V) for non-standard 6.9 in PVC casings — common on irrigation and contractor jobs.
ImprintedIMP suffix
Pitless ModelsC6, JC6, C5-6U
PVC Specialty6.9 in casing
Best ForBranded · pitless · PVC
Watertight Cap Sizing Reference
Match cap to casing OD. M suffix = with 1 in plug for vent or future tap. P suffix = ABS plastic. G suffix = galvanized casing match.
| Part Number | Size | Material | Features | Application |
|---|---|---|---|---|
| WTC6 | 6 in | Aluminum | Standard sealed | 6 in steel casing submersible |
| WTC6M | 6 in | Aluminum | 1 in plug option | 6 in casing with future vent or tap |
| WTC6 IMP | 6 in | Aluminum | Factory imprint | Branded contractor install |
| WTC6G | 6 in galv | Aluminum | Galvanized fit | Galvanized 6 in casing |
| WTC6P | 6 in | ABS | Lower cost | 6 in casing budget install |
| WTC6P-M | 6 in | ABS | ABS + 1 in plug | 6 in ABS w/ future tap |
| LP-5-1 | 5 in | Aluminum | Standard sealed | 5 in casing submersible |
| LP-6-1 | 6 in | Aluminum | Standard sealed | 6 in casing submersible |
| LX-4-1 | 4 in | Aluminum | 3/8 in screen vent | 4 in casing — mild venting |
| LX-5-1 | 5 in | Aluminum | 3/8 in screen vent | 5 in casing — mild venting |
| LX-6-1 | 6 in | Aluminum | 5/8 in screen vent | 6 in casing — mild venting |
| LSW-614 | 6.9 in PVC | Aluminum | PVC-specific fit | Oversize PVC irrigation casing |
| WT4 / WT5 | 4 / 5 in | Aluminum | Watertight | Standard 4 / 5 in |
| SC-4 / SC-5 / SC-6 | 4 / 5 / 6 in | Alum + ABS | Hybrid · budget | Cost-conscious residential |
| SCP4 | 4 in | ABS | Plastic budget | 4 in residential ABS |
| LWC6 | 6 in | Aluminum | Locking | Commercial · multi-family |
Vented Cap Sizing Reference
Vented caps have screened ports for atmospheric balance. Required on jet-pump and pitcher-pump installations.
| Part Number | Size | Material | Application |
|---|---|---|---|
| C6 | 6 in / 6 1/4 in pitless | Aluminum | Submersible w/ pitless adapter installed |
| C5-6U | 5 5/8 in / 6 1/4 in universal | Aluminum | Universal-fit pitless installs |
| JC6 | 6 in / 6 1/4 in jet pitless | Aluminum | Jet pump w/ pitless adapter |
| C4A | 4 in | Aluminum | 4 in casing jet pump |
| C5A | 5 in | Aluminum | 5 in casing jet pump |
| K-6 | 6 in | Aluminum | 6 in casing standard vented |
| K-8 | 8 in | Aluminum | 8 in oversize casing |
| P6 | 6 in | ABS | 6 in casing budget vented |
| P6 IMP | 6 in | ABS | 6 in budget · imprinted |
Selection & Install Notes
A well cap is the surface-level barrier between your drinking water and everything happening above ground — rain, dust, animals, debris.
Submersible = Watertight
Submersible pumps pressurize the system from below — no atmospheric balance needed at the casing top. Always specify a watertight cap on submersible wells. Vented cap on a submersible is a contamination path.
Jet Pump = Vented
Jet pumps draw water up by suction. Without atmospheric balance at the casing top, the casing acts like a sealed container and the suction pressure goes wrong. Always specify a vented cap on jet-pump wells.
Conduit Sealed
The cap typically has a knockout for the submersible power conduit. Seal the conduit penetration with non-shrink grout or compression fitting — an unsealed conduit is the #1 path for surface contamination into the casing.
Above-Grade Mount
Set the casing top at least 6 in above grade per most state well codes (12 in in flood zones). The cap is not designed to seal against standing water — if the cap submerges, contamination is virtually guaranteed.
Locking for Public Access
Commercial wells, multi-family, and any well in an accessible area require a locking cap. LWC6 with padlock provision — many state codes mandate this on public water supplies.
Replace After Pull
The neoprene gasket compresses on first install and never seals as well after removal. Replace the cap (or at minimum the gasket) after every pump pull. A $60–$200 cap is cheap insurance.
Application Selection
New Submersible — 4 in casing
Use WT4 aluminum or SCP4 ABS watertight. Pair with SUB4 or PS4 well seal.
New Submersible — 6 in casing
Use WTC6 aluminum or WTC6P ABS. WTC6M if you want a future vent/tap option built in.
Jet Pump Install — 4 in casing
Use C4A vented aluminum cap. Atmospheric balance is required — do not substitute a watertight model.
Jet Pump — 6 in casing
Use K-6 vented aluminum or P6 vented ABS for budget jobs. Pair with double-hole well seal.
Pitless Adapter Install
Use C6 (submersible) or JC6 (jet) — these have the right contour to seat over the pitless cover plate.
Commercial / Public Access
Use LWC6 locking watertight aluminum. Required on public water supplies in most states — check local code.
Oversize PVC Irrigation Casing
Use LSW-614 or LSW-614V for 6.9 in PVC casing. Standard 6 in caps will not seal — PVC OD is larger.
Branded Contractor Install
Use IMP suffix on standard caps (WTC6 IMP, P6 IMP). Factory imprint adds your contractor identifier without aftermarket stickers that fall off.
Frequently Asked Questions
What's the difference between a well cap and a well seal?
A well seal sits below grade and seals the casing against groundwater intrusion at the drop-pipe penetration. A well cap sits above grade and protects against rain, debris, insects, and surface contamination. Both are required by most state well codes — they serve different functions and don't substitute for each other.
Can I use a watertight cap on a jet-pump well?
No. Jet pumps need atmospheric balance at the casing top to draw water by suction. Sealing the casing creates a vacuum that disrupts pump performance and can damage the pump seals. Always use a vented cap on jet-pump installations. The C-series, K-series, and JC pitless jet caps are purpose-built for this.
Why is the screen on the vented cap important?
The screen prevents insects (especially mosquitoes), spiders, and small debris from entering the casing through the vent ports. Insect intrusion is a real contamination problem — both for water quality and as a vector for bacteria. Inspect the screen annually and replace the cap if torn or corroded.
What's the difference between aluminum and ABS caps?
Aluminum is the long-life, durable choice — resists impact, UV, and most water chemistry. ABS is roughly half the cost and immune to corrosion in iron-laden or salty water. For Houston coastal installs, ABS is often the better long-term choice. For permanent installs in clean water, aluminum lasts longer.
How do I measure my casing for the right cap?
Measure the outside diameter of the casing top — same method as the well seal. Wrap a tape around the casing, divide circumference by 3.14. Then add an inch for clearance. Steel and PVC casing have different ODs at the same nominal size — specify your casing material when ordering.
Do I need a locking cap?
Required on commercial, public, and multi-family wells in most states. Recommended on any residential well in an unfenced or accessible area — protects against vandalism, accidental contamination, and (yes) people pouring things they shouldn't down the casing. LWC6 with a basic padlock is enough to deter casual access.
Can I install a cap over a pitless adapter?
Yes — specifically the C6 (submersible) and JC6 (jet) caps are designed with the right contour to seat over a pitless cover plate. Don't use a standard cap on a pitlessed well — the contour is wrong and you'll get gaps that defeat the seal.
Should I replace the cap when I service the pump?
Yes — or at minimum the gasket. The neoprene gasket compresses on first install and never seals as effectively after removal. The cap itself often shows UV degradation, hairline cracks, or corrosion that's invisible until it leaks. A new cap is $60–$200 — cheap insurance against contamination.
Need Help Picking the Right Cap?
Tell us your casing size and material, pump type (submersible or jet), and whether you're using a pitless adapter. We'll spec the exact Campbell SKU and ship from Houston same day.
281.664.8000
Watermain Supply · Authorized Campbell Manufacturing Distributor · Houston, TX
281.664.8000 · sales@watermainsupply.com · www.watermainsupply.com
281.664.8000 · sales@watermainsupply.com · www.watermainsupply.com
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