答：- Extensive metal and polymer Push-Fit offering, fittings and valves
- Certified and proven reliability for over a decade
- Trusted partner of industry leading brand names
- In-house R&D engineering for innovation and Quick Response to ever changing needs
- Best value at most competitive pricing

答：- Requires no special skills and tools to install, clean and professional
- No loose parts like in crimp, clamp or expansion connections
- A single fitting/valve works with a variety of metal and non-metal tubing
- Installs in seconds, 5 times faster, lower overall & long-term costs
- Removable, repositionable, reusable and repairable
- Save the use of expensive stub outs
- Safer job site; no hazards from flame, glue or adhesives
- Leak free and durable materials that doesn't decay like solder
- Good for tight space and both dry & wet installations
- Serves as union/adaptor between different (material) tubes
- Strong pressure holding capacity and wide working temperature range
- No damage to pipe ends upon connection and disassembly
- Full bore (no inserts), lower pressure or flow loss
- Approved for in-wall or underground applications

答：Yes, Ailun Push-Fit fittings are completely lead-free, ANSI/NSF 372 certified (except for PP drainage series), in compliance with state, local and national lead law standards and regulations.

答：- New construction, remodeling, repair, mobile
- Permanent or temporary plumbing services
- Potable water plumbing
- Oil-free compressed air and inert gas
- Vacuum pipeline system
- Chilled and hot water, cooling or hydronic heating
- Vessel or RV vehicle piping
- General fluid transport
- Drainage DWV (PP drainage series)

答：Ailun fittings are approved for use with Copper, CPVC, PEX and PE-RT. A Tube Stiffener is required when connecting PEX tubing. (PP drainage series work with PP, Sch.40 PVC and ABS tubing.)

答：The Tube Stiffener is neccessary for use with PEX tube. It is not required for copper or CPVC tube; it is however not necessary to remove the stiffener from the fitting.

答：When a tube is pushed past the grab ring and rubber O-ring seal inside a fitting (1) the grab ring applies an opposing grip force, inbedding the teeth onto surface of tube and preventing pull-out, (2) the rubber O-ring creates an instant watertight seal on the outside of the tube, (3) the tube is further inserted till positioned against the Stop section of the fitting to further and fully secure the joint.

答：By pressing the Release Collar of a fitting, with a Removal Tool or built-in Instant-Release type Release Collar, to depress and splay-open the stainless steel Grab Ring away from the tubing, then separate tube from fitting.

答：No, as with sweat copper fittings the tube/pipe must be chamfered, deburred and reamed to be free from burrs and debris. These steps are essential to ensure proper sealing and connection of Push-Fit fittings. Also, be sure to make an Insertion Depth Mark on the tube/pipe to indicate and check (visually) the proper seating/insertion of the tube/pipe into the fitting. A factory supplied Depth-&-Deburr Tool comes in handy for this job.

答：Yes. The Ailun fittings are approved for underground and behind-wall applications without access panel, which should be done in accordance with local plumbing, mechanical codes and practices. If you're considering using Push-Fit in a burial or other concealed applications, be sure to check with local code authorities first. When burying push-fit fittings, make sure they're prevented from making direct contact with soil or backfill by wrapping them with impervious waterproof material, chloride-free tape, insulation, or some other proper barrier protections. The backfill should be free of rocks, debris or any sharp objects that could potentially cause damage to the piping components through impact or abrasion.

答：Ailun Push-Fit fittings (except for PP drainage series) are certified to max. 200 psi and 180°F (82°C).

答：Check and confirm that the position of the Insertion Depth mark on the tube is adjacent to the end of the Push-Fit fitting, and then pressure test the connection in same manner as a solder joint.

答：Yes. As with all types of plumbing fittings, new installations of Push-Fit fittings should be checked to ensure proper connection and performance — test with water or air on completion and before covering the pipe. The system should be installed, pressurized and held under pressure for a period determined by your local and applicable plumbing regulations.

答： Yes, but the pipeline will be cleaner and flush easier and faster since there's no solder and or flux.

答：Ailun Push-Fit fittings can be installed dry or wet, minimizing downtime and interruption. To avoid injury, the system shall be depressurized and cooled prior to installation and any plumbing works on it. No, the presence of water will not affect or compromise the plumbing connection by Ailun Push-Fit fittings.

答：Support requirements are identical to a solder/sweat system. User and installers should adhere to local codes and always appropriately and fully support loads on the plumbing system.

答： No, the O-ring seals in Ailun Push-Fit fittings are pre-lubricated with certified lubricant during manufacturing, and hence no additional lubricant need to be applied. If it is necessary to lubricate the seals in the field, use water. Do not use other grease/lubricants; in particular, don't use any petroleum based lubricants since they're incompatible with EPDM rubber.

答： Glues, adhesives or sealants are not required and should not be applied to the fitting, tube or connection.

答： Ailun Push-Fit fittings can be reused, mainly and usually only for testing purposes. Avoid used fittings in a permanent nstallation. The demount function of Push-Fit fitting is for rectifying issues during plumbing installation or modification to existing pipeline.

答：Yes. The Ailun Push-Fit fitting can be rotated and repositioned after assembly and will not affect the integrity of the installation. Installers should, taking this feature into consideration, properly support pipeline during installation and in final layout.

答： No fittings or water systems should be allowed to freeze or subject to freezing temperatures. Water expands when frozen, and creates pressures that exceed plumbing system pressure capabilities. Hence freezing temperatures may cause any tubes or fittings to burst and fail.

答：You shouln't solder/sweat next to a Push-Fit fitting as the heat may damage and compromise the fitting components. Fabricate solder joints prior to installing Push-Fit fittings, making sure pipe is cooled before installing. If you really need to solder copper tube around installed Push-Fit fittings, stay at least 12 inches away from the Push-Fit connection and take proper precautions to keep the neighboring joints cool while soldering (eg. wrap the Push-Fit connections with a cold wet rag).

答： No. Ailun Push-Fit repair (slip) couplings and tees will work with copper tube best; we do not recommend using with plastic tubes as scratching or scoring of tube surface could potentially cause leakage past the rubber O-ring seal.

答： If you experience any difficulty in inserting tube into a Push-Fit fitting, do not force the insertion/connection. Remove the tube, and check for obstructions. Tip: Push with a twist to facilitate insertion of tube into Push-Fit fittings.

答：There are these three commonly seen installation NG's: (1) tube not properly chamfered/deburred prior to installation, (2) tube not fully and properly inserted, and (3) damages, marks, debris or foreign matters on the surface of the tube.