How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Standard-Wall Plastic Pipe Fittings for Water
Connect these fittings to Schedule 40 plastic pipe–they are the industry standard for residential and commercial low-pressure plumbing and water supply applications. They are plastic for good corrosion resistance.
To prevent leaks in threaded connections, apply a sealant to the male threads. Threaded connections can be taken apart as needed for maintenance and repair. For plastic threads, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections. Note: For fittings that are not rated for pressure, you can use the pressure rating of the plastic pipe as a reference. Threaded fittings are limited to 50% of the rated pressure of the pipe.
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.
- For Use With: Water
- Maximum Temperature: 180° F
- Pipe Nipples and Pipe: Use Schedule 40 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through your wall or panel to create an inlet or outlet.
Pipe Size | For Hole Dia. | For Max. Wall Thick. | Material | Comparable To | Color | Max. Pressure | Each | |
NPT Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/8 | 5/8" | 1/8" | Acetal Plastic | Delrin® Acetal Resin | Black | 120 psi @ 72° F | 8674T54 | 000000 |
| 1/4 | 3/4" | 1/4" | Acetal Plastic | Delrin® Acetal Resin | Black | 120 psi @ 72° F | 8674T55 | 00000 |
| 3/8 | 7/8" | 5/16" | Acetal Plastic | Delrin® Acetal Resin | Black | 120 psi @ 72° F | 8674T56 | 00000 |
- For Use With: Water
- Maximum Temperature: 180° F
- Pipe Nipples and Pipe: Use Schedule 40 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Fittings with a compression end create a seal using a gasket and nut instead of cement or thread sealant, so they're quicker to install than socket-connect and threaded fittings. Insert the pipe and turn the end nuts until hand tight—the nuts compress the gasket against the pipe for a leak-resistant seal. This type of connection absorbs vibration and provides flexibility to reduce stress on your line.
Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall, tank, or panel to create an inlet or outlet for faucets, pipes, and spigots.
| Pipe Size | For Hole Dia. | For Max. Wall Thick. | Material | Gasket Material | Color | Each | |
| 1/2 | 2 3/16" | 3/8" | Polypropylene Plastic | TPR Rubber | Black | 3770K31 | 000000 |
| 3/4 | 2 3/16" | 3/8" | Polypropylene Plastic | TPR Rubber | Black | 3770K32 | 00000 |
| 1 | 2 3/16" | 3/8" | Polypropylene Plastic | TPR Rubber | Black | 3770K33 | 00000 |
| 2 | 3 3/16" | 1/2" | Polypropylene Plastic | TPR Rubber | Black | 3770K34 | 00000 |
| 3 | 4 7/16" | 3/4" | Polypropylene Plastic | TPR Rubber | Black | 3770K35 | 00000 |
- For Use With: Water
- Maximum Temperature: 180° F
- Pipe Nipples and Pipe: Use Schedule 40 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Fittings with a compression end create a seal using a gasket and nut instead of cement or thread sealant, so they're quicker to install than socket-connect and threaded fittings. Insert the pipe and turn the end nuts until hand tight—the nuts compress the gasket against the pipe for a leak-resistant seal. This type of connection absorbs vibration and provides flexibility to reduce stress on your line.
Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall, tank, or panel to create an inlet or outlet for faucets, pipes, and spigots. Fittings for curved tanks are curved to fit the contour of a rounded tank.
| Pipe Size | For Hole Dia. | For Max. Wall Thick. | Material | Gasket Material | Color | Each | |
| 1/2 | 2 3/16" | 3/8" | Polypropylene Plastic | TPR Rubber | Black | 3770K41 | 000000 |
| 3/4 | 2 3/16" | 3/8" | Polypropylene Plastic | TPR Rubber | Black | 3770K42 | 00000 |
| 1 | 2 3/16" | 3/8" | Polypropylene Plastic | TPR Rubber | Black | 3770K43 | 00000 |
| 2 | 3 3/16" | 1/2" | Polypropylene Plastic | TPR Rubber | Black | 3770K44 | 00000 |
| 3 | 4 7/16" | 3/4" | Polypropylene Plastic | TPR Rubber | Black | 3770K45 | 00000 |
UV-Resistant Polypropylene Pipe Fittings for Chemicals
Made of polypropylene, these fittings won’t deteriorate when exposed to the damaging effects of ultraviolet light and are suitable to use outdoors. They have the chemical resistance to withstand a wide variety of acids, solvents, and other harsh substances. Apply a non-hardening, plastic-compatible sealant to the male threads to prevent leaks. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
Schedule 40 fittings have thinner walls than Schedule 80 fittings and are typically used in commercial and residential applications.
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.
- For Use With:
Pipe Sizes 1/8 to 1/2: Air, Calcium Chloride, Sodium Chloride, Water
Pipe Sizes 3/4 to 3: Acetic Acid (5%), Calcium Chloride, Hydrochloric Acid (10%), Phosphoric Acid (85%), Salt Water, Sodium Hydroxide, Sulfuric Acid (30%), Water - Temperature Range: 32° to 140° F
- Pipe Nipples and Pipe: Use Schedule 80 Polypropylene Plastic
- Flanges: Use Class 150 Polypropylene Plastic
| Pipe Size | Schedule | Drive Size | Material | Color | Max. Pressure | Each | |
NPT Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1/8 | 40 | 5/8" | Polypropylene Plastic | Black | 150 psi @ 72° F | 4515K208 | 00000 |
| 1/4 | 40 | 5/8" | Polypropylene Plastic | Black | 150 psi @ 72° F | 4515K209 | 0000 |
| 3/8 | 40 | 3/4" | Polypropylene Plastic | Black | 150 psi @ 72° F | 4515K211 | 0000 |
| 1/2 | 40 | 1" | Polypropylene Plastic | Black | 150 psi @ 72° F | 4515K212 | 0000 |
| Non-Hardening Thread Sealant (8-oz. Brush-Top Can) | 4586K9 | Each | 000000 |
Drain, Waste, and Vent ABS Pipe Fittings for Chemicals
These Schedule 40 fittings are an economical option for gravity-flow chemical waste systems. They are ABS plastic, which has excellent strength and impact resistance and good chemical resistance. Fittings meet ASTM D2661, ASTM D3311, ASTM D3965, and ASTM F1498 specifications and testing requirements for material quality and product dimensions.
Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with ABS cement (also known as solvent weld).
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.
Sealants cannot be sold to Colorado, Connecticut, District of Columbia, Delaware, Illinois, Indiana, Massachusetts, Maryland, Maine, Michigan, New Hampshire, New Jersey, Northern Virginia, New York, Ohio, Pennsylvania, Rhode Island, or Utah due to local VOC (Volatile Organic Compounds) regulations.
- For Use With: Sodium Hydroxide
- Max. Temperature: See table
- Specifications Met: ASTM D2661, ASTM D3311, ASTM D3965, ASTM F1498
- Pipe Nipples and Pipe: Use Schedule 40 ABS Plastic
- Flanges: Use Schedule 40 ABS Plastic
To prevent leaks in threaded connections, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
- For Use With: Sodium Hydroxide
- Maximum Temperature: 180° F
- Specifications Met: ASTM D2661, ASTM D3311, ASTM D3965, ASTM F1498
- Pipe Nipples and Pipe: Use Schedule 40 ABS Plastic
- Flanges: Use Schedule 40 ABS Plastic
To prevent leaks in threaded connections, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
- For Use With: Sodium Hydroxide
- Maximum Temperature: 180° F
- Specifications Met: ASTM D2661, ASTM D3311, ASTM D3965, ASTM F1498
- Pipe Nipples and Pipe: Use Schedule 40 ABS Plastic
- Flanges: Use Schedule 40 ABS Plastic
To prevent leaks in threaded connections, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
- For Use With: Sodium Hydroxide
- Maximum Temperature: 180° F
- Specifications Met: ASTM D2661, ASTM D3311, ASTM D3965, ASTM F1498
- Pipe Nipples and Pipe: Use Schedule 40 ABS Plastic
- Flanges: Use Schedule 40 ABS Plastic
To prevent leaks in threaded connections, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.