Engines in Catalina 30s that have used K1795 as a replacement muffler for the earlier metal, cylindrical mufflers:
• Atomic 4
• 5411

This muffler is not just a generic, off the shelf muffler. It is is carefully designed and custom built for the Catalina 30. It has the correct geometry and large volume that will help prevent expelled raw water coolant from backing up and into an open engine exhaust valve, especially when the boat heals.

To replace your old muffler, confirm that the dimensions found in the Specifications tab and the dimensions on the annotated photo at left under will fit in your boat. It is designed to replace muffler K1795. That said we have no way to guarantee that the K1795 muffler was installed in your boat as Catalina didn't maintain records as to which muffler design was installed in each hull. Each boat was hand built so there may also be variations in your particular boat that might make the installation more challenging. If your old muffler's dimensions match those of the K1795, and you have room for the slightly larger base, this is the correct muffler. If the dimensions don't match K1795, call our technical support line found under "Contact Us" below.

• Base: 14-1/2" X 14-1/2"
• Top: 14" diameter
• Inlet and outlet tube outside diameters: 1-5/8"
• Height including inlet and outlet tubes: 9-1/2" (1/2" shorter so that it can still sit on top of the existing wood platform)
• Drain plug: 3/8" MPT
• Resin: Class 1 fire retardant epoxy vinyl ester thermoset
• Glass: Corrosion-resistant E glass
• Volume, internal: About 4.5 gallons versus the original design that was about 3.8 gallons
• For additional dimensions, refer to the annotated photo at left.

A tip reported by other customers to check fit in your boat: Use an appropriate size cake carrier as a template to check the fit.

Some customers will attempt to repair their old mufflers. Since Carbon monoxide is odorless, colorless, tasteless and deadly, any repairs should be done by a qualified, experienced fiberglass technician.

Two ways I have seen an old muffler fail are:
A) The seam at the bottom edge can fail. This can sometimes be repaired by removing the muffler. After a thorough cleaning, you may be able to saturate the failed joint with WEST epoxy, clamp and allow to cure.

CAUTION! The muffler must be pressure tested to 5 PSI while immersed in a water bath to check for leaks after any repair is attempted. Given the above cautions about carbon monoxide, If it leaks after a repair, YOU COULD KILL SOMEONE. We highly recommend the installation of a carbon monoxide detector.

B) The bond between the inlet tube and the box itself can fail. This typically occurs because the vibration of the engine is transmitted directly through a rigid hose to the stationary muffler. In this case, it is impossible to achieve a successful repair. Even with the installation of a new hump hose to help isolate the vibration (which we highly recommend), there will be much vibration transmitted to the fiberglass tube. To be strong enough, the repair would have to be made on the inside of the muffler where you have no access. In order to leave the enough fiberglass tube exposed for the hump hose, a repair from the outside would be too small to be secure enough given the serious safety concerns involved.

This item does not conform to the shipping table in the Shopping Cart. Additional shipping must be calculated. When you place your order we always call with a shipping quote before billing your card. For a quote in advance, just call 800/959-7245.