1539-1 Seal Kit found on Auto-Belays from Feb 2005 to present date.
This kit includes all of the replacement seals/o-rings.
The difference between the 1539-1 and 1539 seal kits is just one seal. Instead of the two piston seals in the 1539 seal kit, the 1539-1 seal kit has one glide ring and one crown seal for the piston head as well as all other cylinder seals and o-rings.
You might also consider our 1539-3D seal kit. It offers an improvement to the crown seals that typically give out, and we highly recommend it where applicable.
Please confirm your seal kit model by searching on the cylinder for the “1539-1” stamp before ordering. You can find this number on the side of the cylinder, opposite of where the hose connects. The number will start with MPH followed by 4 digit date stamp, and then the next group of numbers is the seal kit.
Please call with any questions.