Max Adapter Compression Fittings For All Your Plumbing Needs
Can a single coupling really change how you finish jobs and avoid callbacks?
You need reliable connections that match common pipe sizes without extra fuss. At Installation Parts Supply, you get 3/8 compression coupling parts that simplify sealing and alignment so your installs look clean and stay strong under pressure.
These couplings fit a wide range of uses: sewer drainage, gravity flow lines, and quick repair jobs on iron, plastic, or steel pipe. Built-in rubber sealing gasket designs resist shear forces and help with pipe alignment for a tight, serviceable joint.
Documented specs like temperature range, nominal diameter fit, and vibration recommendations help you plan each job and select compatible valves and accessories fast.
Shop with confidence at Installation Parts Supply and get authentic parts, fast shipping, and friendly support so you can return to work with fewer surprises.
Your Go-To Source for Reliable Compression Connections at Installation Parts Supply
Why these fittings are a good choice for quick, leak-resistant hookups
Choose components that provide consistent pipe alignment and a secure sealing gasket without needing extra tools. The result is fast, serviceable connections that are ideal for under-sink hook-ups, appliance lines, and light sewer repair work.
The range includes options compatible with copper, plastic, and select steel components. Materials such as 304 series stainless and other series stainless steel parts boost corrosion resistance in wet applications.
- With basic hand tools and proper torque guidance, you can assemble a tight mechanical seal.
- Serviceable joints let you disassemble for maintenance without solder or glue.
- Suitable for potable water, gravity flow, and many sewer drainage applications; avoid locations with high vibration or high heat.
- Nationwide stock plus friendly support help you choose the right coupling and get parts quickly.
| Material | Best Uses | Key Feature |
|---|---|---|
| 304 series stainless | Potable water, light sewer | Strong corrosion resistance |
| Brass body | Fixture lines and appliance connections | Pliable, easier install in cold |
| Ductile iron / cast iron | Sewer repair, gravity flow | Durable in burial or heavy loads |
| Plastic (with insert) | Low-pressure piping lines | Lightweight, avoid shear forces |
Features, Specs, and Performance of Max Adapter Compression Fittings
You get clear, measurable specs so you can select the right coupling for every job confidently, without guesswork.
You work with brass bodies made for copper, aluminum, and thermoplastic pipe. For plastic tubing add the correct insert to maintain tube support and a proper seal.
The temperature range spans from -65°F to +250°F (-53°C to +121°C). Such a wide window covers cold basements as well as warm mechanical rooms and remains within rated pressure limits.
Construction Materials
Brass construction pairs with rubber sealing components for shear resistance and reliable sealing. Series stainless steel parts, like 304 series stainless, are offered for corrosion-prone installs.
Operating parameters
These couplings are designed for low- to medium-pressure liquid lines. They are not recommended for steel tubing or gaseous media. Vibration resistance is fair; use a long nut when you need extra resistance to movement.
Standards and tolerances
The machining is held to +/- .02″ tolerance and meets ASA, ASME, and SAE requirements. Light Pattern (“L”) versions change thread length but remain interchangeable with full pattern parts.
- Not lead free; they’re intended for plumbing and light industrial work such as sewer repair and routine coupling swaps.
- Check tube temperature ratings so all components stay within the fitting’s acceptable envelope.
- Avoid excessive movement to preserve ferrule grip and rubber seal life.
| Specification | Value | Notes | Best Use |
|---|---|---|---|
| Material | Brass or 304 series stainless options | Rubber seal and securing cage available | Copper, aluminum, and thermoplastic pipe |
| Temperature | -65°F to +250°F | Refer to tubing temperature rating for maximum pressure | Cold water, warm mechanical rooms |
| Dimensional Tolerance | +/- .02″ | Conforms to ASA / ASME / SAE | Precise alignments and repeatable torque settings |
| Limits | No steel tubing / no gaseous media | Fair vibration resistance; long nut for more | Low/medium pressure liquid applications |
Installation Parts Supply stocks these spec-driven parts so you can meet jobsite requirements with confidence and fewer surprises.
Pipe Compatibility, Applications, and Installation Notes
Confirming material compatibility before cutting a tube saves time and helps prevent leaks later.
These couplings are designed to work with copper, aluminum, and thermoplastic tubing. When using plastic tube, add the correct insert to support the wall and preserve the seal.
Designed for low- to medium-pressure liquid lines, these parts suit fixture supplies, appliance hookups, and light sewer repair. Because they are not rated for gaseous media or steel tubing, avoid those uses to stay within safe limits.
Installation Tips
- Cut the tubing square and deburr lightly so the ferrule can seat evenly.
- Keep the tube axis aligned with the body and start the nut by hand to prevent cross-threading.
- Bring the fitting up gradually to the recommended turn-of-nut, then recheck once the line is pressurized.
- For higher vibration, choose a long nut and support nearby runs to reduce movement.
- Maintain clearance for future service so the nut, ferrule, and cage are accessible for inspection or repair.
| Material | Recommended Application | Notes/Comments |
|---|---|---|
| Copper / Aluminum | Fixture lines and appliance feeds | Straightforward installs; good seal with proper torque |
| Thermoplastic | Low-pressure water runs | Requires insert to support the tube wall |
| Steel | Not recommended | Avoid use; select tube-rated couplings instead |
You can count on Installation Parts Supply to supply the correct inserts, long nuts, and accessory parts for a smooth installation. Follow the checklist—confirm tube material, add an insert for plastic, align properly, tighten to spec, and recheck—to reduce callbacks and keep jobs on schedule.
Pricing, Availability, and Related Solutions
Find clear pricing and fast availability so you can plan materials and labor with confidence.
Some manufacturers require retailers to follow a Minimum Advertised Price (MAP) policy. When an item is under MAP, our lowest price appears after you add the product to your cart. You’re free to view that price without obligation and remove the item whenever you like.
How pricing works online
Under MAP policies, the checkout process reveals the final low price for qualifying items. That approach protects manufacturer programs and still provides transparency for you. If you’re comparing prices, simply add to cart to see the real offer, then remove it if you’re not ready.
Cost-Saving Combos and Related Options
You can often save money by choosing bundled parts or purpose-built valves instead of buying separate pieces.
- At $12.92 each, the John Guest Angle Stop Max Adapter Valve (SKU PPASV-6) is commonly less expensive than buying a separate coupling plus valve.
- Bundles reduce part count, speed installs under sinks, and lower return risk by matching compatible components like cage inserts and clamping system pieces.
- Fast fulfillment and clear inventory let you line up pipe, steel parts, and sewer repair items so jobs stay on schedule.
| Purchase Option | Primary Use | Notes/Details |
|---|---|---|
| Single Coupling | Custom assemblies | Flexible option but may require additional parts |
| Angle stop valve (PPASV-6) | Fixture shutoff point | $12.92; often lower total cost than separate valve and coupling |
| Bundle (Valve + Insert) | Under-sink installations | Speeds work; fewer callbacks |
Shop Installation Parts Supply for competitive pricing, quick turnaround, and bundled solutions that simplify your cart.
Final Thoughts
When each joint matters, selecting the right part and support speeds installs and cuts callbacks.
You choose a practical, code-conscious solution for liquid supply lines when you pick the correct product and follow the installation guidance. Match copper, aluminum, or thermoplastic tubing (use an insert for plastic) to get a reliable seal that’s easy to service later.
Avoid steel tubing and any gaseous media to keep installations safe and within spec. Use recommended valves and the proper cage and accessories to boost vibration resistance and long-term performance for sewer and fixture work.
Installation Parts Supply can help you select the correct Max Adapter Compression Fittings and arrange fast shipping across the United States. When you need assistance, support is available from selection to checkout so you can finish clean, on schedule, and on budget.
Common Questions
What types of pipes work with these compression connectors?
These compression connectors are compatible with copper, aluminum, and many thermoplastic pipes when you use a proper insert for softer plastics. They are not intended for use with standard steel tubing or pressurized gaseous media. When working with cast iron, ductile iron, asbestos cement, and PVC sewers, verify the product’s nominal diameter and sealing gasket compatibility before installation.
What are these connectors made of?
The bodies are brass with stainless steel components in key areas, plus a pliable rubber sealing gasket to ensure leak resistance. Some variants feature 304 series stainless steel parts along with a high-impact securing cage or clamping system to add strength and durability.
How do these connectors handle vibration and shear forces?
They’re designed to withstand vibration and moderate shear forces thanks to the steel click-lock clamping and a cast iron or ductile iron rated cage in heavy-duty models. The rubber sealing gasket helps maintain a tight seal, while the clamping system absorbs movement to protect joints from loosening.
Can these fittings be installed in cold conditions?
Yes. The rubber gasket remains flexible for easier installation during cold weather, and stainless steel parts resist embrittlement. To get the best outcome, follow torque guidelines carefully and give yourself extra time for alignment in very cold temperatures.
Which operating pressure and temperature limits apply to these connectors?
These connectors generally operate in low-to-medium pressure plumbing applications and temperature ranges from about -65°F to +250°F for compatible materials. Always confirm the specific model’s rating, especially when working near upper temperature or pressure limits.
Are these connectors built to industry standards?
Many models meet ASA/ASME/SAE tolerances and maintain tight dimensional control (often +/- .02). Look for model certifications and material listings to ensure compliance with your project’s codes.
Are inserts required for plastic pipe?
Yes, for most thermoplastic pipes you should install an insert to prevent deformation and ensure proper sealing. The insert helps maintain alignment and reduces risk of leak or failure under pressure.
How do I ensure proper pipe alignment during installation?
Clean and square the pipe ends, use a guide or insert for plastics, and engage the click-lock clamping evenly. The securing cage and high-impact clamping system help maintain alignment while you tighten to the recommended torque values.
Can I use these connectors on sewer repair and gravity flow lines?
Yes, certain models are suitable for sewer repair and gravity flow drainage when sized correctly for the nominal diameter and when the rubber sealing gasket is compatible with wastewater. Verify compatibility with iron, cast iron, and asbestos cement pipe types if they’re in the run.
How do online pricing and availability work?
Pricing often follows MAP policy and you may see the lowest available price in your cart at checkout. Installation Parts Supply and similar vendors list related options such as angle stop valves and cost-saving combos; compare these to find the best solution for your budget and job.
What related options should I consider for cost savings?
Look for bundled valve-and-coupling combos, angle stop adapters, and multi-pack deals. Choosing stainless steel click-lock models only in areas where they’re necessary can save money while still putting steel components where strength matters most.
What is the expected life of the rubber sealing gasket in sewer or drainage service?
Service life depends on the level of exposure to chemicals, abrasion, and temperature. In typical sewer and gravity-flow applications, a high-quality rubber gasket paired with stainless steel components can last many years. Be sure to inspect periodically and replace the gasket if you observe hardening or cracking.