Euplokeer 17in Gas Strut Pair for Knaack Master 89/90/91 Tool Box Lids — 17.20in Extended, Screwdriver-Install

Replace worn or weak lid supports on your Knaack Storagemaster 89/90/91 tool job box with these two 17.20-inch gas lift struts from Euplokeer. Built to match the common 977-2PK interchange, the set is intended as a direct-fit maintenance part for heavy-duty tool chests used on jobsites and in service vehicles. The parts ship as a pair and are designed for straightforward DIY replacement without special tools.

Will these gas struts fit my Knaack Master 89, 90 or 91 toolbox?

These struts are made to be compatible with Knaack Storagemaster tool boxes referenced by the interchange numbers 977-2PK and 9772PK. To be certain they match your unit, compare the OEM number and extended length of your existing lift supports before buying.

• Designed for Knaack Master 89/90/91 series (977-2PK / 9772PK).
• Extended length: 17.20 inches — compare with your current cylinder.
• Match pound-force rating and OEM part number for exact fitment.

How easy is installation and what tools do I need?

Installation is intended to be user-friendly: you only need a flat-head screwdriver to remove and attach the retaining clips. The struts come ready to mount and can be swapped without mechanical lifts or special tools, saving time on the jobsite.

• Installer tool: single flat-head screwdriver required.
• Quick clip-style end fittings for fast removal and replacement.
• Simple two-person lift recommended for safe alignment when replacing heavy lids.

What are the physical specs and what does the package include?

This listing supplies two identical gas lift supports with an extended length of 17.20 inches. The pair is sized for multi-purpose use on heavy-duty toolbox lids and other similar applications where the specified length and force are required.

• Included: 2 gas struts (pair) pre-assembled for mounting.
• Extended length: 17.20 in — check against your old cylinders.
• Clip-style mount ends compatible with standard toolbox brackets.

How do I choose the correct replacement if I’m unsure about the original part?

Start by noting the OEM interchange number stamped on the original cylinder and measure the extended length from end to end. Compare those details and the pound-force rating to this 17in Euplokeer strut specification to select a proper match.

• Find OEM number on your old gas strut and compare to 977-2PK / 9772PK.
• Measure extended length of the old support; this product is 17.20 in.
• Match pound rating if available for optimal lift and hold behavior.

Who is this for? This Euplokeer 17-inch gas strut set is aimed at contractors, fleet managers, and DIY technicians who maintain Knaack Storagemaster 89/90/91 tool boxes or need a reliable pair of replacement lid supports for heavy-duty jobsite chests. If your toolbox lid sags, slams, or no longer stays open, these replacement shocks restore safe, controlled opening and closing with a straightforward install and 15-month product exchange support from Euplokeer.