{"product_id":"alltrade-powerbuilt-piston-ring-compressor-set-940387-6-band-ratcheting-clamps-2-88-4-38-range-with-storage-case","title":"Alltrade Powerbuilt piston ring compressor set 940387 — 6-band ratcheting clamps, 2.88–4.38\" range with storage case","description":"\u003cp\u003e\u003cstrong\u003eThe Alltrade Powerbuilt Piston Ring Compressor Set is a six-band, ratcheting clamp kit that compresses piston rings securely for fast, damage-free piston installation.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen rebuilding or servicing an engine, installing pistons without harming rings or cylinder walls requires a reliable ring compressor. This Powerbuilt kit (model 940387) supplies six adjustable steel bands, a ratcheting clamping tool and a heavy-duty storage case with laminated, permanently attached instructions—everything needed to compress rings for pistons from 2 7\/8\" (73 mm) to 4 3\/8\" (111 mm). The design focuses on repeatable fit, safe handling and organized storage so both pros and DIYers can work efficiently.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this set protect piston rings during installation?\u003c\/h3\u003e\n\u003cp\u003eThe kit holds rings evenly around the piston circumference so they don't snag or spring out during insertion. The ratcheting pliers allow gradual tensioning for precise compression and consistent clearance, reducing the risk of ring end damage or misalignment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSix tapered bands distribute pressure evenly across ring gaps.\u003c\/li\u003e\n  \u003cli\u003eRatcheting clamp tightens in small increments for controlled compression.\u003c\/li\u003e\n  \u003cli\u003eBands lock in place to keep rings recessed while inserting the piston.\u003c\/li\u003e\n  \u003cli\u003eLaminated instruction sheet shows correct technique and alignment tips.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich piston sizes and engines will this compressor handle?\u003c\/h3\u003e\n\u003cp\u003eThe set covers a broad range of piston diameters so it fits many automotive and light-truck applications. Each band is sized to overlap and tighten, letting you match the band to the piston diameter for a snug, secure fit.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCovers pistons from 2-7\/8\" (73 mm) up to 4-3\/8\" (111 mm).\u003c\/li\u003e\n  \u003cli\u003eSix specific band ranges accommodate small-block through many big-bore pistons.\u003c\/li\u003e\n  \u003cli\u003eSuitable for most cars, light trucks and small engines that fall in the size range.\u003c\/li\u003e\n  \u003cli\u003eBand sizes: 2-7\/8\"–3-1\/8\", 3-1\/8\"–3-3\/8\", 3-3\/8\"–3-5\/8\", 3-5\/8\"–3-7\/8\", 3-7\/8\"–4-1\/8\", 4-1\/8\"–4-3\/8\".\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes the ratcheting clamp and bands durable and easy to use?\u003c\/h3\u003e\n\u003cp\u003eThe clamp is engineered for incremental ratcheting action so you can tighten without slipping, and the bands are made from robust material that resists deformation during repeated use. Together they provide dependable grip and long service life in a garage environment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRatcheting lock pliers provide secure, tool-assisted tightening and release.\u003c\/li\u003e\n  \u003cli\u003eSturdy bands maintain shape and pressure under repeated cycles.\u003c\/li\u003e\n  \u003cli\u003ePermanently attached, laminated instructions resist grease and wear.\u003c\/li\u003e\n  \u003cli\u003eIncluded carrying case prevents loss and protects the kit between jobs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow simple is it to learn and store this tool set?\u003c\/h3\u003e\n\u003cp\u003eAlltrade includes step-by-step, photo-illustrated instructions fixed inside the case, so you won’t need an external manual. The compact case keeps bands and pliers sorted and ready, speeding setup for the next piston job.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstructions are laminated and permanently fastened inside the case for clarity and longevity.\u003c\/li\u003e\n  \u003cli\u003eCase compartments keep each band and tool organized by size for fast selection.\u003c\/li\u003e\n  \u003cli\u003eLightweight, portable kit fits easily on a workbench or in a toolbox drawer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The Alltrade Powerbuilt Piston Ring Compressor Set is aimed at professional mechanics, engine builders and informed DIYers who need a reliable, versatile compressor for multiple piston sizes. If you frequently assemble engines, restore vehicles, or perform piston swaps and want a compact, durable kit with clear instructions and a controlled ratcheting clamp, this set provides the necessary components to compress rings safely and repeatably.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What piston diameter range does this kit cover?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It covers pistons from 2-7\/8\" (73 mm) up to 4-3\/8\" (111 mm) using six adjustable bands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are instructions included for proper use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—laminated, photo-illustrated instructions are permanently attached inside the case for quick reference.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Alltrade","offers":[{"title":"Default Title","offer_id":48087755653278,"sku":"B0028QGTP4","price":109.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/alltrade-powerbuilt-front-packaging.jpg?v=1785930478","url":"https:\/\/northtrailauto.ca\/products\/alltrade-powerbuilt-piston-ring-compressor-set-940387-6-band-ratcheting-clamps-2-88-4-38-range-with-storage-case","provider":"North Trail Auto","version":"1.0","type":"link"}