How To Build an Adjustable 9 Square with PVC Pipe and Fittings

Jul 18, 2023
6 min read

Updated: Aug 19

9 Square is a fast-moving volleyball-style game played beneath a raised grid of nine squares. Players hit the ball from one square to another, trying to keep the ball in play and advance to the center square. It is easy to learn, works for a wide range of ages and skill levels, and gets people talking and moving almost immediately.

This guide explains how to build an adjustable 9 Square game using PVC pipe, structural PVC fittings, and Circo Snap Clamps. The design can be assembled for players of different heights, broken down for transport, and used at camps, youth groups, schools, athletic programs, family gatherings, beaches, and backyard parties.

What Is 9 Square?

The game is played under a four-sided overhead frame divided into nine equal playing squares. Each player occupies one square. The player in possession of the ball hits it upward through the frame and into another player's square. That player must hit it onward before it bounces or leaves the playing area.

The objective is to reach the center square and remain there as long as possible. Depending on the group, players can rotate into open spaces after an error or use a simple elimination-and-rotation system. The basic rules are simple enough for first-time players, while the quick reactions and changing ball angles keep the game fun for older players too.

The commercial game known as 9 Square in the Air was developed to help groups interact through an active, low-pressure game. Circo's PVC version is designed for builders who want an adjustable, transportable structure made from readily assembled PVC components.

For official rules and instructions for playing the game, visit 9 Square in the Air's learn-to-play page.

Why Build a PVC 9 Square Game?

A fixed-height game can work well for one group, but an adjustable PVC frame is more versatile. The telescoping design lets you change the height for children, teens, and adults. You can also take the frame apart when the event is over instead of leaving a large structure assembled.

PVC is a practical choice for this project because it is lightweight, easy to cut, and simple to work with using structural fittings. Circo Snap Clamps help secure the upper framework while allowing the game to be assembled and disassembled more easily than a permanently glued structure.

The finished game is useful anywhere you need a portable group activity:

Youth camps and church programs
Schools and physical education classes
Summer camps and recreation programs
Team-building events
Athletic clubs and tournaments
Beaches, parks, and campgrounds
Birthday parties and backyard gatherings

Parts and PVC Cut List

The following parts are used for Circo's adjustable PVC 9 Square design. The quantities and dimensions below are based on the original Circo build instructions. Dry-fit your pieces before cutting or assembling, and confirm that your pipe and fittings match the sizes in your kit.

4 — 1-1/4-inch 5-way fittings, Circo Item #54-F
4 — 1-1/4-inch 3-way fittings, Circo Item #34-F
8 — 1-1/4-inch 4-way fittings, Circo Item #44-F
4 — 1-1/4-inch 4-foot Snap Clamps, Circo Item #04
40 — sections of 1-1/4-inch PVC pipe cut to 58-3/4 inches
16 — sections of 1-5/8-inch inside-diameter pipe cut to 5 feet

You will also need a tape measure, marker, PVC cutting tool or fine-tooth saw, and a clean, flat assembly area. Depending on how you plan to use the game, you may also want soft end caps, a storage bag, or a way to label matching sections for faster setup.

How the Adjustable Design Works

The smaller PVC sections form the main grid and frame. The larger inside-diameter pipe sections act as sleeves for the adjustable uprights. By sliding the smaller pipe within the larger sleeve, you can raise or lower the playing grid before securing it with the Snap Clamps.

The fittings create the corners, intersections, and support points of the overhead frame. The 5-way fittings and 3-way fittings are used at the frame's structural transitions, while the 4-way fittings connect the sections that form the nine-square grid.

Because this is a modular design, it is important to keep the fittings oriented consistently. A fitting that is rotated incorrectly can change the direction of a pipe run and make the grid difficult to square. Lay out the parts on the ground first and compare the arrangement with the Circo build video before final assembly.

Assembly Overview

1. Measure and label the pipe

Cut the 1-1/4-inch PVC into forty 58-3/4-inch sections. Cut the 1-5/8-inch inside-diameter pipe into sixteen 5-foot sleeve sections. Mark the cut lengths clearly so the frame is easier to organize.

Remove burrs from every cut end. A smooth edge makes it easier to insert the pipe into fittings and helps prevent damage to the inside of the larger sleeve pipe.

2. Lay out the frame on the ground

Arrange the fittings and pipe sections in the order shown in the Circo instructions. Build the frame in sections rather than trying to hold the entire structure in the air at once. Check that the grid is square and that each fitting is facing the correct direction.

At this stage, do not permanently glue pieces together. A dry fit allows you to correct the orientation, make sure the parts are in the right locations, and confirm that the structure can be separated for storage.

3. Assemble the nine-square grid

Connect the 1-1/4-inch pipe sections with the 4-way fittings to create the overhead grid. The finished layout should form nine playing spaces arranged in a three-by-three pattern.

Use the 3-way and 5-way fittings where the frame transitions into its corners and supports. Press each connection together firmly, but avoid striking the fittings with a hammer or other hard object.

4. Add the adjustable support sections

Set the 1-5/8-inch sleeve sections into the support locations and slide the smaller PVC sections into them. The sleeve-and-inner-pipe arrangement creates the telescoping adjustment.

Raise the grid evenly. Make sure all support points are set to the same height before playing. If you are building for younger players, start with the frame lower and increase the height as the group becomes comfortable.

5. Secure the structure with Snap Clamps

Use the four 1-1/4-inch 4-foot Snap Clamps at the designated support locations. The clamps help hold the adjustable sections in position while keeping the design removable.

Before anyone plays, inspect every connection and clamp. Confirm that the frame is stable, the uprights are at matching heights, and no pipe ends or fittings are loose. Recheck the frame whenever it is moved to a new location.

Safety and Setup Tips

9 Square is an active game, so select a level playing surface with enough open space around the frame. Keep the game away from overhead branches, power lines, sharp objects, vehicle traffic, and other structures.

Use a soft volleyball or similar lightweight ball appropriate for the players. Younger children may need a lighter or slower-moving ball. Establish boundaries around the game and stop play if the frame shifts, a fitting separates, or the playing area becomes crowded.

Do not allow players to climb on the frame or hang from the PVC grid. The structure is intended to support the game, not the weight of a person. Inspect the pipe, fittings, and clamps before each use, especially after transporting the game.

Watch the Build and See It in Use

Use these videos to see the PVC 9 Square design, assembly sequence, and gameplay:

You can also see how the adjustable game works at different heights and in different locations, including outdoor and beach setups. Keep the existing article photos in place if they are still accurate, and update their captions and alt text to describe the game clearly.

Get the 9 Square Fittings Kit

If you want to build this project without sourcing every structural fitting separately, Circo offers a 9 Square Fittings Kit.

You can also shop Circo PVC fittings and Snap Clamps for other adjustable PVC projects. For additional build ideas, visit the Circo PVC plans page.

An adjustable PVC 9 Square game is a practical way to turn a few pipe sections and fittings into a reusable activity for groups. Build it once, adjust the height for your players, and take it wherever people are ready to play.

Updated August 2026

Credits: 9 Square in the Air and Circo Innovations