Pro-Line Tanks

Amtrol Pro-Line tanks are pre-pressurized diaphragm-style well water pressure tanks designed for residential well water systems to maintain steady water pressure and reduce pump cycling. Amtrol Pro-Line tanks feature deep drawn steel construction, a butyl diaphragm that permanently separates water from the air charge, a polypropylene liner, a 304L stainless steel system connection, Amtrol's Turbulator water circulator, and a factory precharge of 38 PSIG. The Pro-Line lineup spans 10 tank sizes from 14 gallons through 119 gallons, with a 125 PSIG maximum working pressure, a maximum relief valve setting of 100 PSIG, a maximum operating temperature of 200°F, and a 5-year warranty on all models. Pro-Line tanks carry a NSF Standard 61 listing across the lineup. For a plumbing or well water contractor specifying a pressure tank for a residential well system, the Pro-Line diaphragm design won't crease or trap debris as bladder designs can, which makes it a more durable choice in systems where sediment or particulate may be present in the supply.

KEY SUBCATEGORIES / PRODUCT TYPES

Smaller Pro-Line Tanks: PL-14, PL-20, and PL-26

The Amtrol PL-14, PL-20, and PL-26 are the three smallest Pro-Line diaphragm well tanks, sharing the same 15" diameter and 1" NPTF system connection across all three sizes. The PL-14 (SKU CA3001) carries 14 gallons total volume, stands 25" tall, and weighs approximately 24 lbs. The PL-20 (SKU CA4202) carries 20 gallons total volume, stands 32" tall, and weighs approximately 30 lbs. The PL-26 (SKU CA6000) carries 26 gallons total volume, stands 39" tall, and weighs approximately 37 lbs. All three share the same 15" diameter and 12" stand diameter, making them suited for tight well houses and applications with constrained floor footprints. All three share the Pro-Line construction: deep drawn steel, butyl diaphragm, polypropylene liner, 304L stainless steel system connection, 38 PSIG factory precharge, 125 PSIG maximum working pressure, and 200°F maximum operating temperature.

Mid-Range Pro-Line Tanks: PL-32 and PL-34

The Amtrol PL-32 (SKU CA8003) and PL-34 (SKU CA8205) are the most commonly specified sizes for single-family residential well systems and illustrate a critical geometry decision in tank selection. The PL-32 carries 32 gallons total volume, stands 47" tall, has a 15" diameter, a 1" NPTF system connection, and weighs approximately 43 lbs. The PL-34 carries 34 gallons total volume, stands 30" tall, has a 22" diameter, a 1-1/4" NPTF system connection, and weighs approximately 50 lbs. Same approximate volume class. Very different footprint and height profile. The PL-32 fits in narrow spaces with sufficient ceiling height. The PL-34 fits in wider spaces with lower ceilings. Both share deep drawn steel construction, butyl diaphragm, polypropylene liner, 304L stainless steel system connection, 38 PSIG factory precharge, 125 PSIG maximum working pressure, 200°F maximum operating temperature, and a 5-year warranty. The PL-32 has a 12" stand diameter; the PL-34 has a 20-1/2" stand diameter.

Larger Pro-Line Tanks: PL-44 through PL-119

The larger Pro-Line tanks serve higher-demand residential applications and installations requiring greater drawdown capacity and extended pump-off cycles. The PL-44 (SKU CA10050) is 44 gallons, 36" tall, 22" diameter, 1-1/4" NPTF, and weighs approximately 57 lbs. The PL-62 (SKU CA12051) is 62 gallons, 47" tall, 22" diameter, 1-1/4" NPTF, and weighs approximately 75 lbs. The PL-81 (SKU CA17255) is 81 gallons, 57" tall, 22" diameter, 1-1/4" NPTF, and weighs approximately 92 lbs. The PL-86 (SKU CA17002) is 86 gallons, 47" tall, 26" diameter, 1-1/4" NPTF, and weighs approximately 99 lbs. The PL-119 (SKU CA22050) is 119 gallons, 62" tall, 26" diameter, 1-1/4" NPTF, and weighs approximately 133 lbs. The PL-81 and PL-119 may require a lift gate for delivery due to size and weight. All larger Pro-Line tanks share the same deep drawn steel construction, butyl diaphragm, polypropylene liner, 304L stainless steel system connection, 38 PSIG factory precharge, 125 PSIG maximum working pressure, 200°F maximum operating temperature, and 5-year warranty.

Pro-Line Diaphragm Design vs. Bladder-Style Tanks

The defining design difference between Amtrol Pro-Line tanks and bladder-style pressure tanks is how water and air are separated. In the Pro-Line diaphragm design, a butyl diaphragm is anchored inside the deep drawn steel shell, permanently separating the water from the pre-pressurized air charge. A bladder-style design contains the water inside a separate flexible bag suspended inside the tank. Amtrol's diaphragm won't crease or trap debris as bladder designs can, which is a meaningful advantage in well water systems where sediment or particulate may be present in the supply. The polypropylene liner provides additional protection between the water and the steel shell. The 304L stainless steel system connection and Turbulator water circulator are additional construction features consistent across the Pro-Line lineup.

BUYING GUIDE / HOW TO CHOOSE

Selecting the right Amtrol Pro-Line tank starts with sizing based on pump flow rate, pressure switch setting, and system demand. A tank that's too small results in rapid pump cycling, which shortens pump life. Amtrol's ESP Quick Sizing guidance recommends matching tank size to the pump's discharge rate and cut-in/cut-out pressure setting. For a 10 GPM pump on a 40/60 pressure switch, Amtrol's guidance points toward the PL-44 or larger. Confirming tank sizing against Amtrol's current sizing documentation for the specific pump and pressure switch combination is required before specifying.

Physical dimensions are the second filter and matter most in tight well houses. The geometry choice at the 32-to-34-gallon range makes this concrete. The PL-32 is 15" in diameter and 47" tall with a 1" NPTF connection. The PL-34 is 22" in diameter and 30" tall with a 1-1/4" NPTF connection. Same approximate volume. Ceiling height and floor footprint determine which one fits. Getting the physical dimensions confirmed against the installation space before ordering avoids a return.

System connection size also changes across the lineup. The PL-14, PL-20, PL-26, and PL-32 all use a 1" NPTF connection. The PL-34, PL-44, PL-62, PL-81, PL-86, and PL-119 all use a 1-1/4" NPTF connection. Confirming the piping size at the connection point before specifying prevents a mismatch.

The factory precharge on all Pro-Line tanks is 38 PSIG. For installation, the precharge should be verified and adjusted to 2 psi below the pump cut-in pressure before the tank is placed in service. Annual precharge checks are recommended to maintain proper tank performance. If the air charge is lost, the diaphragm bottoms out against the tank shell and the tank won't function correctly.

FAQs

What is an Amtrol Pro-Line tank and how does it work?

An Amtrol Pro-Line tank is a pre-pressurized diaphragm-style well water pressure tank that maintains steady water pressure and reduces pump cycling in residential well systems. Pro-Line tanks work by using a butyl diaphragm anchored inside a deep drawn steel shell to permanently separate the pressurized air charge from the water. When the pump runs, water fills the tank and compresses the air charge. When a fixture opens, the compressed air pushes water out of the tank to the system until the pressure drops to the pump cut-in point. All Pro-Line tanks carry a 125 PSIG maximum working pressure, a 38 PSIG factory precharge, a 200°F maximum operating temperature, and a 5-year warranty.

What is the difference between the PL-32 and PL-34, and how should the choice be made?

The difference between the Amtrol PL-32 and PL-34 is geometry and system connection size. The PL-32 (SKU CA8003) is 15" in diameter, 47" tall, weighs approximately 43 lbs., and uses a 1" NPTF system connection. The PL-34 (SKU CA8205) is 22" in diameter, 30" tall, weighs approximately 50 lbs., and uses a 1-1/4" NPTF system connection. Both carry 125 PSIG maximum working pressure and a butyl diaphragm with polypropylene liner. A low-ceiling well house calls for the PL-34. A narrow floor plan with sufficient ceiling height calls for the PL-32. The system connection size difference also means the piping configuration at the connection point should be confirmed before ordering.

What are the dimensions and weights of all Amtrol Pro-Line tank models?

Amtrol Pro-Line tank dimensions and weights from Amtrol's official submittal data book MC4400 (01/24) are as follows: PL-14 is 15" diameter, 25" height, 24 lbs.; PL-20 is 15" diameter, 32" height, 30 lbs.; PL-26 is 15" diameter, 39" height, 37 lbs.; PL-32 is 15" diameter, 47" height, 43 lbs.; PL-34 is 22" diameter, 30" height, 50 lbs.; PL-44 is 22" diameter, 36" height, 57 lbs.; PL-62 is 22" diameter, 47" height, 75 lbs.; PL-81 is 22" diameter, 57" height, 92 lbs.; PL-86 is 26" diameter, 47" height, 99 lbs.; PL-119 is 26" diameter, 62" height, 133 lbs. All dimensions and weights are approximate per Amtrol.

What is the maximum working pressure and factory precharge for Amtrol Pro-Line tanks?

The maximum working pressure for all Amtrol Pro-Line tanks is 125 PSIG, with a maximum relief valve setting of 100 PSIG. The factory precharge on all Pro-Line models is 38 PSIG. At installation, the precharge should be adjusted to 2 psi below the pump cut-in pressure to maintain correct tank performance. The maximum operating temperature across the Pro-Line lineup is 200°F. All Pro-Line tanks carry a 5-year warranty per Amtrol's current submittal documentation.

How does the system connection size vary across the Pro-Line lineup, and which models use which connection?

Amtrol Pro-Line tanks use two system connection sizes across the lineup. The PL-14, PL-20, PL-26, and PL-32 all use a 1" NPTF 304L stainless steel system connection. The PL-34, PL-44, PL-62, PL-81, PL-86, and PL-119 all use a 1-1/4" NPTF 304L stainless steel system connection. The connection size change aligns with the transition from the 15" diameter tank body to the 22" and 26" diameter tank bodies. Confirming the piping size at the tank connection point before specifying is required to avoid a mismatch between the tank connection and the existing system piping.