What is the purple thing plumbers use?

Author: Gretchen Borer  |  Last update: Tuesday, June 16, 2026

Black Swan Purple Primer is a purple, non-bodied, fast acting solvent used to soften, clean and prepare plastic pipe and fittings prior to assembly. Purple Primer can be used with all types, schedules and classes of PVC and CPVC pipe and fittings. A low VOC formulation.

What is the purple glue plumbers use?

The Oatey 8 oz. PVC and CPVC Purple Primer, made from a mixture of solvents, is designed to remove surface dirt, oils and other contaminants from the surface of PVC or CPVC piping. Not recommended for use on ABS piping installations.

What is the purple stuff you put on PVC pipe?

Oatey® Purple Primer is an NSF-listed, aggressive primer for use on all schedules and classes of PVC and CPVC pipe and fittings. It removes contaminants such as surface dirt, grease and grime as well as softens the pipe surface to allow for a fast, secure solvent weld.

Is purple PVC primer necessary?

PVC primer maximizes the strength and longevity of the joint connection. A joint will still weld together without the primer, but the connection will not be as strong as the primer allows the cement itself to penetrate deeper into the material.

How to remove purple plumbers glue?

Use these steps:
  1. Remove as much of the hardened glue as you can with a plastic scraper without damaging the floor. ...
  2. Apply a small amount of acetone-based nail polish remover with a clean soft cloth. ...
  3. Remove the loosened glue gently and repeat the process a few times if required.

How To Prime & Glue PVC Pipe like a Master Plumber

Is plumbers glue permanent?

Many homes now have PVC plastic for most of the plumbing. If you're working with this type of pipe, PVC primer and glue will permanently weld the plastic parts together. However, this adhesive will not bond to metal pipes.

How to remove purple PVC primer from hands?

How to remove PVC glue from hand skin?
  1. Soak your hands in a solution of hot water (as hot as you can stand) and antibacterial hand soap. This well help to soften the PVC glue. ...
  2. Saturate a cotton ball with acetone nail polish remover. Rub the cotton ball on the glue on your hands. ...
  3. Rinse your hands well under warm water.

How long does purple PVC primer last?

PVC cements, primers, and cleaners generally have a shelf life of three years, as do ABS cements and cleaners.

What is the purple stuff used in plumbing?

Black Swan Purple Primer is a purple, non-bodied, fast acting solvent used to soften, clean and prepare plastic pipe and fittings prior to assembly. Purple Primer can be used with all types, schedules and classes of PVC and CPVC pipe and fittings.

Is it code to use purple primer on PVC?

Although ASTM F 656 only recommends that PVC primer be purple, this is a code requirement. The purple coloring is intended to allow the installer and the inspector to verify that the required primer has been applied.

How long does it take for purple PVC glue to dry?

It takes another 15 minutes for the joint to harden to a point at which it can withstand water pressure and two hours to fully cure. That would wait at least 10 minutes after you glued your pipe together.

What does PCV pipe look like?

PVC pipes are white or dark gray in color. CPVC is off-white, light gray, or yellow in color. Both pipe types have technical specifications printed on the side for easy verification.

What happens if you don't use primer on PVC?

While you may be able to create strong joints without it, primer is an important part in making sure your joints are as strong as they possibly can be. We recommend you use primer on any joints that will have liquid media passing through them.

Is purple primer better than clear primer?

A: Yes, the NSF listed Clear Primer and Purple Primer are the same product... only difference is the colorant which is for identifiable purposes.

How to apply purple primer to PVC?

First, you apply primer — a purple liquid that cleans and preps the PVC — to the outside of the pipe and the inside of the fitting. Wait 10 seconds and then apply the cement — a clear and thicker liquid — on top of the primed areas. Insert the pipe into the fitting and let the cement set.

Do you let PVC primer dry before gluing?

The primer should still be wet when applying the cement. This means that the chemicals within the primer are still evaporating, but the appearance will look dry. The proper time frame to apply cement and finish the joint assembly is within five (5) minutes after the primer is applied.

Can you use too much PVC glue?

TOO MUCH SOLVENT CEMENT IS ASKING FOR TROUBLE.

They dissolve PVC. Clearly if you apply enough they will dissolve the pipe.

Why do plumbers use purple primer on PVC?

The purple primer can be used on both PVC (polyvinyl chloride) and CPVC (chlorinated polyvinyl chloride) pipes. The purpose of the primer is to clean and soften the outer coating of the pipe so that the actual cement will bond more effectively.

Will PVC glue work if pipe is wet?

The Red Hot Blue Glue works in wet, dry or humid conditions and can be used without a primer (where codes permit). Weld-On® 705™ PVC cement is a high-strength formula.

How many psi is household water?

Your home's water pressure typically ranges between 40 and 80 psi (pounds per square inch). Water pressure below 40 psi is considered low, and water pressure above 80 psi is considered too high. Having the water pressure set too high, over 80 psi, can lead to broken water pipes and costly bills.

What is the strongest glue for PVC pipe?

Best MMA Plastic Adhesive: Infinity Bond MMA 420 Glue

This is one of the strongest glues for PVC in terms of shear strength. It is chemical resistant, temperature resistant, impact resistant, and weather resistant, so it can be a good choice for many different applications.

Does purple PVC primer go bad?

PVC & ABS Cements / Primers and Cleaners have 3 year shelf life from date of manufacture, and CPVC has 2 year shelf life from date of manufacture.

What happens if you get PVC primer on your skin?

Repeated exposure may cause skin dryness or cracking. Causes serious eye irritation.

What removes purple PVC glue?

For PVC glue that has started to set, you'll need to use acetone on a clean cloth to wipe it away.

Previous article
What is the most clean room ever?
Next article
Do some toilets have a stronger flush?