The nylon will be fine, MLT temps are relatively low. I finally ordered a number of high temp o-rings in various sizes so I have them on-hand now (http://www.brewershardware.com/O-Rings/). Many brewing websites have them in the typical sizes we use.
Something is always fermenting
...."It's Bahl Hornin'"Primary: Brite Tank/Lagering:
Cider, German Pils, Belgian Tripel, Bedeviled (Bel. Golden Strong), AHA Summer Ale, Sonoma County Organic Cider, Maibock Bock, Ommegang Abbey Ale CloneBottled:
Contentment (Trappist), Derangement (Belgian Dark Strong), Kranky (Kolsch v1.1), Wise One (Wit)On Deck: My Site: www.restlesscellars.com