1 in stock
$329.95 $355.49


The NLP Waterlocks/Mufflers are of dual stage construction, featuring upper and lower chambers with a horizontal partition plate and a riser tube through the centre. Compared with single stage Waterlocks using only one chamber, these NLP Waterlocks offer superior silencing of exhaust noise with minimal back pressure. Since the top chamber may be rotated through 360° and both the inlet and the outlet connectors can rotate through 360°, installation of the exhaust assembly even in confined engine spaces is greatly simplified.

The rotatable inlet of the Waterlock is connected to the engine exhaust manifold, using VETUS exhaust hose. The exhaust gases, mixed with cooling water are forced from the lower chamber into the upper one, via the central riser tube and then through the (also rotatable) outlet connector at the top. This outlet connector is coupled to the transom connector, again by means of VETUS exhaust hose. 

Provided with drain plugs (for winter storage). Straps to secure the Waterlock to the boat are supplied as standard.

Hose Sizes: 40/45/50 have 4.5 Litre Capacity  

Hose Sizes: 60/75/90 have 10 Litre Capacity (Picture showing larger dimensions fits these hose sizes and hence the price increase)

Note; There is a NLP50S (50mm hose fitting) in a 10 Litre Capacity. (listed seperate)

Shipping and returns

Shipping and customer service

We use Australia Post Eparcel for shipping if goods within Australia. If you would like to use an alternative shipping method please Contact Us and we can discuss alternatives.

When you contact us, a real person will call you back! This is what separates us from our competitors. We are a real store on QLD's Gold Coast with over 30 years experience in boating and Customer care.

Returns policy

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can contact us at If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

You can always contact us for any return question at

Have a question
Postal Address:

PO Box 138, Main Beach QLD 4217

Street Address:

Southport Yacht Club, Macarthur Parade, Main Beach QLD 4217

Trading Hours

Monday - Friday - 7.30am – 5pm
Saturday - 8am to 4pm
Sunday - 8am to 12noon


(07) 55 911 911 | Fax (07) 55 916 147


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