What is a Snap Clamp? The Complete Guide

Jun 29, 2016

3 min read

Updated: Aug 19

If you've called Circo Innovations, you've probably heard someone say: "Snap — like snap your fingers. Clamp — like clamp something down." We've been explaining the name since 1996. After 30 years, the product still raises that question from first-time callers, so here's the full answer.

The Simple Explanation

A Snap Clamp is a U-shaped plastic clip that snaps over PVC pipe to hold a covering material — poly film, shade cloth, netting, tarp, canvas, or fabric — against the pipe without tools, screws, or wire.

You fold your covering material over the pipe, press the Snap Clamp over it, and it locks in place. To remove the covering, you peel the clamp back off. That's the whole mechanism. No drill. No screws. No grommets.

Why It Matters for PVC Builders

Before Snap Clamps existed, attaching a cover to a PVC frame meant one of several bad options:

Drilling through the pipe and running wire (weakens the pipe, hard to remove)
Using baling wire or zip ties (tears fabric, frustrating to undo, looks terrible)
Buying expensive commercial clamps designed for metal conduit (wrong profile, doesn't grip cleanly)
Clamping with wood battens (heavy, requires tools, not reusable)

Snap Clamps solve all of those problems. They're reusable, they don't damage the covering material, they work in cold weather without cracking, and they hold firmly against wind pull.

What Snap Clamps Are Used For

Greenhouses and hoop houses The most common application. Snap Clamps secure 6 mil poly film along the base pipe of a hoop house so the cover stays down in wind but can be removed in minutes to vent or service the structure. They're also used for roll-up sides — attach the bottom of the poly to a baseboard pipe with Snap Clamps so you can roll up the sides on warm days without removing anything permanently.

Low tunnels and row covers On a small scale, Snap Clamps hold floating row cover fabric over hooped ribs in a garden bed. They keep the fabric from blowing off in wind while remaining easy to remove daily for watering or pollination.

Carports and vehicle covers Snap Clamps attach tarps and UV-rated covers to PVC carport frames. Much faster to install and remove than ropes or straps, and the cover lies flat without bunching.

Shade structures In summer, Snap Clamps hold shade cloth over patio structures, chicken runs, garden beds, or outdoor kennels. The cloth can be swapped out seasonally without disassembling the frame.

Boat and RV covers Snap Clamps secure fitted covers to curved support frames. The clamp grips the curved pipe profile cleanly even when the cover is under tension from wind.

Event backdrops Theater, photography, and event professionals use Snap Clamps to hang fabric backdrops from PVC pipe stands. The cover can be swapped between events in minutes.

Snap Clamp Sizes

Snap Clamps come in sizes to match standard PVC pipe outside diameters:

Snap Clamp size	Fits pipe OD	Common pipe size
1/2"	0.840" OD	1/2" schedule 40
3/4"	1.050" OD	3/4" schedule 40
1"	1.315" OD	1" schedule 40
1-1/4"	1.660" OD	1-1/4" schedule 40
1-1/2"	1.900" OD	1-1/2" schedule 40
2"	2.375" OD	2" schedule 40

Important: Snap Clamp size refers to the pipe size, not the clamp's own dimensions. Match the clamp size to the pipe you're building with.

Cable Clamps: The Wire Version

For structures where the covering is attached to wire cable or rope instead of rigid PVC pipe, Circo makes Cable Clamps — the same snap-on mechanism adapted for round wire runs. These are used for netting enclosures, vineyard bird netting, and structures where wire is the structural element.

How Many Do You Need?

General rule: one Snap Clamp every 12–18 inches along any edge where the covering material is attached to a base pipe. For greenhouse hoop houses with 4-year poly film, spacing them every 12 inches at the base and every 24 inches along the sides is typical.

Browse the full selection of Snap Clamps and Cable Clamps in our catalog, or visit our sizing help page if you're not sure which diameter fits your pipe.

Updated August 2026. Originally published June 2016.