Best Merrill in 2026

No lead brass construction

1 in. x 1 in. female NPT

Prevents backflow in well or irrigation systems

Standard water well pump replacement switch designed for use of electrically driven water well pumps of all types (Jets, Submersible, Reciprocating etc)

Cut-In Pressure 40 PSI - Cut-Off Pressure 60 PSI - Adjustable

Large silver contacts for longer service life

Controls electrically driven water pumps

Cut-In Pressure 40 PSI - Cut-Off Pressure 60 PSI - Adjustable

Extra large silver contacts for longer service life

Pressure relief valves are for protection against excessive pressure

3/4 in. male NPT x 1/2 in. female FPT

Lead free brass with stainless steel control springs

Compatible with shallow well or drive point applications

No- Lead

Adjustable Cap for Handle Positions

Pressure relief valves are for protection against excessive pressure

1/2 in. male NPT x 1/2 in. female FPT

Lead free brass with stainless steel control springs

Pressure relief valves are for protection against excessive pressure

1/2 in. male NPT x 1/2 in. female FPT

Lead free brass with stainless steel control springs

Pressure relief valves are for protection against excessive pressure

Lead free brass with stainless steel control springs

3/4" Line Connection, 100 PSI

Standard water well pump replacement switch designed for use of electrically driven water well pumps of all types (Jets, Submersible, Reciprocating etc)

Cut-In Pressure 30 PSI - Cut-Off Pressure 50 PSI - Adjustable- Low Pressure Cut-Off - Manual Lever

Large silver contacts for longer service life

Water Pump Pressure Switch

Turns on at 40 psi and off at 60 psi

Individually boxed

Heavy duty cast iron body construction with internal pump cyclinder

Designed for shallow well applications (25' or less)

Antique Style - Molded rubber flapper & cup seal

G65 - Plunger bushing

G70 - Plunger body

G75 - Plunger bolt

Bronze body construction ensures durability and long life

Designed for minimum head loss

The bonnet is made of engineered thermoplastic and protects valve body from costly freeze damage

1-1/2 slip x slip unions

Flapper bends over a radius to eliminate sharp 90-degree edges

Capable of vertical or horizontal installation

For Oxygen Pumps Only: Great 1-way check valve for most common aquarium air pumps. NOT suitable for CO2 or other high-pressure systems to avoid crack and leak.

Small & Light: Size: 2.1" L x 0.55" W; Diameter of air holes: 0.12"; Weight: 0.1 oz. Standard ID airline tubing: 3/16". Add little weight to your hose for smooth airflow.

Ideal Pump Protectors: Prevent backflow of water through the tubing during a power outage or pump pause. Essential accessories for basic aeration setup in your fish tanks.

For Oxygen Pumps Only: Great 1-way check valve for most common aquarium air pumps. NOT suitable for CO2 or other high-pressure systems to avoid crack and leak.

Small & Light: Size: 2.1" L x 0.55" W; Diameter of air holes: 0.12"; Weight: 0.1 oz. Standard ID airline tubing: 3/16". Add little weight to your hose for smooth airflow.

Ideal Pump Protectors: Prevent backflow of water through the tubing during a power outage or pump pause. Essential accessories for basic aeration setup in your fish tanks.

No lead brass construction

1 in. x 1 in. female NPT

Prevents backflow in well or irrigation systems

Will fit any 1-1/4-inch or 1-1/2-inch NPT male or female thread

Made from durable ABS plastic

High quality Nitril-Bruna N seal

Schedule 40 PVC construction for strength and resistance to corrosion and mild chemicals

EPDM seal for resistance to water and oils

Maximum pressure rating of 150 psi

Upgraded stainless spring & pin make STRONGER spring tension

Improved chlorine-resistant and corrosion-resistant fabrication on flapper and rubber seal

Enhanced cover construction to be anti-crack and sturdy

Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)

GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors

GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle

Material ※ The shell material is ABS resin, and the Diaphragm material is silicon rubber

Performance※ Normal performance under 25 ℃ to 60 ℃,Strong resistance to acid, alkali, salt corrosion ability

Application ※Check valve is used in fluid system to prevent reverse flow fluid, or used in pneumatic system to prevent reverse flow of compressed air

Top-mounted test cocks allow for easy installation

EZSwap pressure vessel reduces repair time and costs

Flush Tool (FLUSH) provides easy line flushing, saving up to 15 minutes per installation

Several configuration options ease installation and repairs

Horizontal or vertical installation reduces installation time and associated costs

Comes standard with a union inlet connection and integral body outlet connection

Clear PVC for corrosion resistance, high strength, and less weight than fittings made from metal

Full flow design for insignificant flow loss at swing check

Slip connection for easy attachment

Diameter ※ 10mm/0.39 inch

Total length ※ 43mm/1.69 inch

Material ※ The shell material is ABS resin, and the Diaphragm material is silicon rubber

Product Size:3/4" Thread Female

This valve is used to prevent the back flow of fluids

Maximum pressure rating 200 psi，200 WOG (water, Oil, gas)

【Material】The shell material is PVDF, and the Diaphragm material is silicon rubber

【Diameter】 1/2"barb, can fit 1/2" hose ID

【Performance】Normal performance under 25 ℃ to 60 ℃,Strong resistance to acid, alkali, salt corrosion ability

G 1/8 Female Full Ports One Way Air Check Valve.

Nickel-plated brass for durability. The brass valve core is wear-resistant, pressure-resistant and corrosion-resistant and has stable performance.

When installed and used, the tail of the arrow is connected to the gas input source, and the head of the arrow is connected to the output end.