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MERRILL PITLESS PRODUCTS
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Compare Merrill pitless units, kits and adapters using the details that matter most for your installation.
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| Why Choose It? | Complete pitless control system that protects VFD components at the well. | Factory-assembled, pressure-tested and built for full-diameter well access. | Complete stainless unit with heavy-duty system support. | Factory-tested complete system for Illinois installations. | Matched full-system components with 10 field-assembly. | Stainless clear-well kit for existing steel or plastic casing. | 304 stainless connection with high support capacity and corrosion resistance. | No-lead brass connection with broad sizing and proven value. |
| Best For | Constant-pressure installations needing controls and tank at the well. | Customers wanting the most complete, factory-prepared system. | Wells where stainless steel and corrosion resistance are priorities. | Illinois wells requiring the approved configuration. | Installers wanting a complete kit with on-site flexibility. | Installers prioritizing clear well access and stainless components. | Standard installations where stainless steel is preferred. 5" or larger well. | Standard residential wells where simplicity and value matter.5" or larger well. |
| What You Get | Pitless control unit with manifold, cap and mounting plate | Complete pitless unit | Complete stainless pitless unit | Complete Illinois-approved unit | Pitless installation kit | Stainless clear-well kit | Stainless adapter | No-lead brass adapter |
| Factory Testing & Leak Protection | 150 PSI maximum. Buna-N O-rings and watertight aluminum cap. | 100% factory pressure tested. Parts pinned for repeatable alignment and sealing. | 100% factory pressure tested. Extra-large O-ring seals body to casing. | 100% factory pressure tested. Large spud gasket seals casing opening. | 120 PSI rated. Gasketed kit is assembled and sealed on site. | 120 PSI rated. Thick O-ring and clamped discharge hub installed on site. | 150 PSI rated. Dual gasket/O-ring connection installed on site. | 150 PSI rated. Dual gasket/O-ring connection installed on site. |
| Pump Removal & Well Access | Built-in pull strap removes the manifold; no special pulling tool needed. | Full-diameter access with guided removal and reinstallation. | No internal obstructions; adjusting nut allows easy disengagement. | No internal obstructions; service pump without disturbing buried line. | Clear access when assembled; adjusting nut disengages seal for service. | No internal obstructions; service without pulling pump to drain outside system. | Slide-style adapter removal using a pull pipe. | Slide-style adapter removal using a pull pipe. |
| Water-Contact Materials | No-lead brass or stainless waterways; Buna-N O-rings. | Stainless discharge and internal sealing elbow. | Stainless internal body with Buna O-ring; stainless elbow available. | Stainless discharge, cast-iron sealing elbow and neoprene gasket. | Painted cast-iron sealing elbow and discharge hub; stainless elbow available. | Stainless internal body, discharge hub and U-strap with Buna O-ring. | 304 stainless body, elbow, collar and nut with Buna seals. | No-lead brass body, elbow, collar and nut with Buna seals. |
| System-Weight Support | Integrated 12 in. upper casing supports control components at the well. | Top support plate holds pump, pipe and water weight. | Heavy-duty bar holds 160% more than typical aluminum bars. | Top support plate holds pump, pipe and water weight. | Support plate carries pump, pipe and water from top of well. | Heavy-duty bar holds 160% more than typical aluminum bars. | Supports 600-1,400 ft., depending on model and pipe type. | Supports 300-600 ft., depending on model and pipe type. |
| System Fit | 4, 5, 6 or 8 in. casing 3-7 ft. bury 1 to 2 in. discharge |
3-8 in. casing 1-8 ft. bury 1-1/4 to 3 in. pipe |
4-6 in. casing Multiple bury depths 1 or 1-1/4 in. pipe |
4-6 in. casing Multiple bury depths 1-1/4 or 2 in. pipe |
4-10 in. casing 1-8 ft. bury 1-1/4 to 3 in. pipe |
4-6 in. steel/plastic casing 1 or 1-1/4 in. pipe |
5-8 in. casing 1 or 1-1/4, 2" in. connections |
5-12 in. casing 1 to 2 in. connections |
| Approvals | Wisconsin DNR, Minnesota Department of Health and other state approvals. | PAS-listed configurations and applicable state approvals. | PAS-1, PAS-2, PAS-97, ASSE 1093, IAPMO CA and Illinois Code. | Illinois approved; PAS-1, PAS-2, PAS-97, ASSE 1093 and IAPMO CA. | PAS-1, PAS-2, PAS-97, ASSE 1093 and Illinois Code. | PAS-1, PAS-2, PAS-97, ASSE 1093, IAPMO CA and Illinois Code. | NSF/ANSI 372, PAS, ASSE and IAPMO CA; selected Illinois models. | NSF/ANSI 372, PAS, ASSE and IAPMO CA; selected Illinois models. |
| Installation Work | Connect controls on site | Factory-prepared | Complete unit | Factory-prepared | Assemble on site | Install on site | Install on site | Install on site |
| Key Advantage | VFD, tank and control manifold protected at the well | Full-diameter access with guided removal | Clear well access; no internal obstructions | Service pump without disturbing buried line | Top-supported system with clear access | No internal obstructions during service | High support capacity and corrosion resistance | Proven performance and value |
| Important Detail | 150 PSI / 180 F maximum | Factory pressure tested | Stainless internal body | Illinois approved | 120 PSI rated | 120 PSI rated | 150 PSI rated | 150 PSI rated |
Still Not Sure Which Pitless Solution You Need?
Have your well size, bury depth and discharge size ready. Merrill can help match the product to the job.
*Support depth varies by model and pipe type. Confirm product specifications, availability and local code requirements before ordering.