Yes, we can supply adapters to fit 12mm outside diameter (the most common caravan / boat size). (This makes your new filter perfectly comaptible with other caravan brands like the Whale Aquasource WF1230) These 12mm adapters normally cost around £12 (see our parts / accessories page). But to get you going we will give these at less than half price - if you buy a cartridge from us. usual filter price without adapters is £16.95. With adapters is £19.95 Please note you only need to buy the adapters once - for ongoing use. (For example your replacement cartridge cost next season will only be £16.95 - including your loyalty discount). ORDER ANYTIME Day or Night 24/7 for NEXT DAY DELIVERY With FREE Delivery Immediate Dispatch Purchase with Total Confidence Money Back Guarantee Click here for delivery information No hidden extras If you don't like what you get, send it back for a full no quibble refund. If for any reason you decide to return your purchase we promise you a no questions asked THREE MONTH Money Back Guarantee. Click here to read the "large print" about our Money Back Guarantee. PLUS We'll even pay your return postage ! Please order now to secure today's sale price. ADD TO BASKET Product Code: FLN2000-12mm