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Features:*The operate of the piston ring is to preserve the air tightness between the piston and the cylinder wall.*With normal inner and outer diameter size, it's handy to install and disassemble.*The for has no casting defects comparable to cracks, pores, looseness, etc., making certain tight connection.*The package consists of three substitute piston rings(Including 2pcs stability ring+1pcs seal ring), which may replace the previous or broken ones on the air pump at any time.*Suitable for air compressors and air pumps with a cylinder diameter of 42mm/47mm/48mm/51mm/52mm/65mm/90mm/95mm/100mm, and wish to get replaced when the axial clearance is greater than 0.13mm.Specifications:*Item Type: Air Compressor Piston Ring*Compatible for: Air Compressor*Size: As photograph show*Applicable cylinder diameter: 42mm 47mm 48mm 51mm 52mm 65mm 90mm 95mm 100mm, Please Choose the proper size.*Quantity: 3pcsPackage Contents:3 x Air Compressor Piston RingNote:1. The genuine color of the article may be slightly varied from the photographs proven on web page caused by many points comparable to brightness of your monitor and light-weight brightness.2. Please allow slight guide dimension deviation for the data.