Plastic Econoline Ladder 2-Tread Kit With Hardware - 17.25 Inch Width pool-dimensions_16.5x35.5 5 inch Aluminum Cam and

5 inch Aluminum Cam and Groove Female Coupler x Female NPT Thread

Please note the IN is not 4 inches

The tester's probe is dipped into a sample of pool water and the results are ready instantly

This opening allows introduction of air or water pressure into the system you are testing

Plastic Econoline Ladder 2-Tread Kit With Hardware - 17.25 Inch Width pool-dimensions_16.5x35.5 5 inch Aluminum Cam andThis is a package of two S. R. Smith Econoline 17. 25 inch replacement ladder treads which are designed for 1. 90 inch rails. Made of high impact plastic, this step tread is recommended for residential ladders. Hardware is included: 3 8 inch x 3 1 4 inch bolts, washers and hex nuts. Our ladder tread width measurements are from center to center. Please measure the center to center dimensions of your rails before ordering.