PSS Type A Shaft Seal, PYI Inc World leading dripless mechanical face seal for marine applications. Ideal replacement for packing glands and lip seals in marine or industrial environments Highly durable, low maintenance and cost-effective solution. Certified by ABS, BV (or Bureau Veritas), RINA, and US Coast Guard approved. Manufactured in the USA. Two nitrile o-rings seal the stainless steel rotor to the shaft and will not experience wear. A primary set screw and a backup set screw (2 sets) are used to secure the stainless steel rotor to the shaft. A seal is created between the two flat surfaces of the carbon stator and the stainless steel rotor. Water is fed into the PSS Shaft Seal for cooling/lubricating the seal faces on high speed vessels. The stationary carbon stator is attached to the nitrile bellow, which is attached to the stern tube (shaft log).